I was able to create the following with the Scalable Vector Graphics - Custom Visualization app in Trellis layout for consideration.
Example SPL -
| makeresults count=4
| streamstats count
| eval name = CASE (count==1, "WAF06", count==2, "WAF09", count==3, "WAF42", count==4, "WAF99")
| eval count = random()%10000
| stats sum(count) as count by name
| eval svg_viz = "<svg version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 1000 1000\">
<g><g transform=\"translate(0.000000,511.000000) scale(0.100000,-0.100000)\"><path d=\"M6176.2,4322.5c-23.7-9.9-51.4-39.6-61.3-63.3c-9.9-25.7-21.7-298.7-29.7-609.2c-5.9-310.5-17.8-619.1-23.7-686.3l-11.9-124.6l-2927.4-4L195,2829.2l-47.5-55.4l-47.5-55.4V-208.9c0-3121.2-4-3016.3,89-3052c17.8-5.9,1119.5-11.9,2444.7-11.9h2413.1l134.5-114.7c379.8-328.3,743.7-518.2,1222.4-638.9c694.2-176,1432-96.9,2068.9,221.5c269,134.5,464.8,273,688.3,486.6c379.8,367.9,611.2,785.2,712.1,1291.6c45.5,221.5,31.7,751.6-27.7,1087.9c-104.8,595.4-344.2,1263.9-652.7,1819.7c-112.7,203.7-162.2,243.3-265,205.7c-61.3-21.8-73.2-41.5-174.1-308.6c-73.2-193.8-257.1-498.4-356-589.4l-55.4-49.4l11.9,59.3c49.5,237.4,94.9,526.1,112.8,700.2c67.3,678.4-55.4,1309.4-348.1,1776.2c-417.4,666.6-1032.5,1252-1661.5,1580.4C6285,4344.3,6253.4,4352.2,6176.2,4322.5z M6621.3,3794.4c632.9-419.3,1256-1161,1428.1-1703c185.9-581.5,156.3-1323.3-87-2142.1c-73.2-249.2-73.2-310.5,7.9-352.1c63.3-35.6,118.7-25.7,241.3,39.6c259.1,138.5,508.3,403.5,702.2,749.6l100.9,178l75.2-164.2c419.3-915.8,591.4-1809.8,466.8-2417c-185.9-900-985-1600.2-2009.6-1760.4c-298.7-47.5-727.9-31.6-1018.6,37.6C5571-3514,4886.6-2853.4,4706.6-1977.2c-13.8,65.3-23.7,229.4-23.7,365.9c4,559.8,158.2,971.2,718,1898.8c575.6,955.3,749.6,1354.9,878.2,2027.4c73.2,383.7,130.5,987,130.5,1400.4c0,166.2,5.9,211.6,25.7,199.8C6447.2,3907.2,6532.3,3851.8,6621.3,3794.4z M3482.3,1711.7v-811H1949.4H416.5v811v810.9h1532.9h1532.9V1711.7z M5994.3,2492.9c0-75.2-102.9-498.4-166.1-694.3c-67.2-197.8-290.8-682.4-385.7-832.7l-41.6-65.3h-801.1h-801.1v811v810.9h1097.8C5857.8,2522.6,5994.3,2518.7,5994.3,2492.9z M2034.4-220.8l-5.9-807l-805-5.9l-807-4v811v811h811h811L2034.4-220.8z M5203.1,572.4c0-5.9-85-154.3-191.9-330.3c-296.7-500.4-458.9-852.5-571.6-1256c-5.9-19.8-225.5-23.7-1050.3-19.8l-1044.3,5.9l-5.9,807l-4,805h1434C4558.3,584.2,5203.1,578.3,5203.1,572.4z M3482.3-2145.3v-811H1949.4H416.5v811v811h1532.9h1532.9V-2145.3z M4378.3-1664.7c7.9-271,19.8-367.9,61.3-526.1c47.5-185.9,185.9-500.4,298.7-680.4l51.4-85h-494.5h-496.5v811v811h284.8h282.8L4378.3-1664.7z\"/></g><text dominant-baseline=\"central\" text-anchor=\"middle\" x=\"715\" y=\"690\" font-family=\"sans-serif\" font-weight=\"bolder\" font-size=\"150\" fill=\"black\">".count."</text>
</g>
</svg>"
Dashboard XML -
<dashboard>
<label>Firewall</label>
<row>
<panel>
<viz type="svg.svg">
<search>
<query>| makeresults count=4
| streamstats count
| eval name = CASE (count==1, "WAF06", count==2, "WAF09", count==3, "WAF42", count==4, "WAF99")
| eval count = random()%10000
| stats sum(count) as count by name
| eval svg_viz = "<svg version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 1000 1000\">
<g><g transform=\"translate(0.000000,511.000000) scale(0.100000,-0.100000)\"><path d=\"M6176.2,4322.5c-23.7-9.9-51.4-39.6-61.3-63.3c-9.9-25.7-21.7-298.7-29.7-609.2c-5.9-310.5-17.8-619.1-23.7-686.3l-11.9-124.6l-2927.4-4L195,2829.2l-47.5-55.4l-47.5-55.4V-208.9c0-3121.2-4-3016.3,89-3052c17.8-5.9,1119.5-11.9,2444.7-11.9h2413.1l134.5-114.7c379.8-328.3,743.7-518.2,1222.4-638.9c694.2-176,1432-96.9,2068.9,221.5c269,134.5,464.8,273,688.3,486.6c379.8,367.9,611.2,785.2,712.1,1291.6c45.5,221.5,31.7,751.6-27.7,1087.9c-104.8,595.4-344.2,1263.9-652.7,1819.7c-112.7,203.7-162.2,243.3-265,205.7c-61.3-21.8-73.2-41.5-174.1-308.6c-73.2-193.8-257.1-498.4-356-589.4l-55.4-49.4l11.9,59.3c49.5,237.4,94.9,526.1,112.8,700.2c67.3,678.4-55.4,1309.4-348.1,1776.2c-417.4,666.6-1032.5,1252-1661.5,1580.4C6285,4344.3,6253.4,4352.2,6176.2,4322.5z M6621.3,3794.4c632.9-419.3,1256-1161,1428.1-1703c185.9-581.5,156.3-1323.3-87-2142.1c-73.2-249.2-73.2-310.5,7.9-352.1c63.3-35.6,118.7-25.7,241.3,39.6c259.1,138.5,508.3,403.5,702.2,749.6l100.9,178l75.2-164.2c419.3-915.8,591.4-1809.8,466.8-2417c-185.9-900-985-1600.2-2009.6-1760.4c-298.7-47.5-727.9-31.6-1018.6,37.6C5571-3514,4886.6-2853.4,4706.6-1977.2c-13.8,65.3-23.7,229.4-23.7,365.9c4,559.8,158.2,971.2,718,1898.8c575.6,955.3,749.6,1354.9,878.2,2027.4c73.2,383.7,130.5,987,130.5,1400.4c0,166.2,5.9,211.6,25.7,199.8C6447.2,3907.2,6532.3,3851.8,6621.3,3794.4z M3482.3,1711.7v-811H1949.4H416.5v811v810.9h1532.9h1532.9V1711.7z M5994.3,2492.9c0-75.2-102.9-498.4-166.1-694.3c-67.2-197.8-290.8-682.4-385.7-832.7l-41.6-65.3h-801.1h-801.1v811v810.9h1097.8C5857.8,2522.6,5994.3,2518.7,5994.3,2492.9z M2034.4-220.8l-5.9-807l-805-5.9l-807-4v811v811h811h811L2034.4-220.8z M5203.1,572.4c0-5.9-85-154.3-191.9-330.3c-296.7-500.4-458.9-852.5-571.6-1256c-5.9-19.8-225.5-23.7-1050.3-19.8l-1044.3,5.9l-5.9,807l-4,805h1434C4558.3,584.2,5203.1,578.3,5203.1,572.4z M3482.3-2145.3v-811H1949.4H416.5v811v811h1532.9h1532.9V-2145.3z M4378.3-1664.7c7.9-271,19.8-367.9,61.3-526.1c47.5-185.9,185.9-500.4,298.7-680.4l51.4-85h-494.5h-496.5v811v811h284.8h282.8L4378.3-1664.7z\"/></g><text dominant-baseline=\"central\" text-anchor=\"middle\" x=\"715\" y=\"690\" font-family=\"sans-serif\" font-weight=\"bolder\" font-size=\"150\" fill=\"black\">".count."</text>
</g>
</svg>"</query>
<earliest>-1m</earliest>
<latest>now</latest>
<sampleRatio>1</sampleRatio>
</search>
<option name="height">220</option>
<option name="drilldown">none</option>
<option name="trellis.enabled">1</option>
<option name="trellis.scales.shared">1</option>
<option name="trellis.size">medium</option>
</viz>
</panel>
</row>
</dashboard>
While it is not using the same query, hopefully, you get an idea on how to put it together.
I found and tweaked the following SVG image (firewall) from OnlineWebFonts as the basis of the firewall images.
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