homeassistant

I've successfully run HA and PiHole (and also HA and Adguard) on the same pi4 before now.

First I would check and see if you can get your current router to use a DNS address other than the one your IP put on it. If that's the case (unlike me) you can just point your router at your PiHole (or Adguard) DNS and have adblocking network wide.

If you can't do that (like me) then I've had quite good results from having PiHole (or Adguard) running as my DHCP server. This is the thing in your network that gives all your devices their IP address. First you turn it off in your router, then turn it on in PiHole and configure it from there. You can then have this DHCP server point at your PiHole DNS and have adblocking network wide.

The downside is that all your devices will then have a new IP address given by the new DHCP server. To combat this, you should save your IP reservations or maybe even all the IP addresses on your network, and set them as static IP addresses on your PiHole DHCP server.

It works. But if your Pi goes down at any time your devices may forget who they are (lose their IP address reservations) and have a bit of an existential crisis. Easy fix, usually just turn it off and on again and reboot your router, and maybe all your devices, so they can "Find Themselves" again.

Best of luck