Where do we need to install this app exactly? Indexer? Search Head?
Since this app only contains search time extractions you only need to install it on your search heads.
As noted, you will still need to configure an input to collect the DHCP logs (if you don't have this already)
An example of this is included on the details tab.
I decided to leave the inputs.conf out of the app, because in many situations DHCP servers are sensitive assets, so pushing 'downloaded' apps to them may be un welcomed.