Sure, OpenWRT is good and there’s an Adguard Home plugin for it. You don’t need to buy any hardware to use Pihole though, many people run it in a container on an existing machine. So it comes down to the functionality you need or want and the software you prefer, right?
Use the second option of a static MAC to IP map and add the relevant records to each pihole’s local DNS.
Router may not have a function you want.
You can just run two DHCP servers. Give them non-overlapping ranges or give them the same MAC to IP mapping.
I never see anything from threads anywhere… search results, cable news, etc. Who’s using it even?
We’ve already seen AI fall for obvious jokes, like whether you can melt an egg or put pineapple on pizza.
A definite opportunity for a Loops video