Not sure if this ever got solved, but I’m running Pihole on my network and eero for gateway, routing, Wi-Fi, and dhcp functions. The gateway address (i.e. 192.168.0.1) is the only one that shows up in the pihole logs.
I have DNS Caching off on my eero configuration, and I’ve got conditional forwarding on on the pihole config.
Anything else I can do to have the individual IPs actually make requests to the pihole without being intercepted by the eero?
Not sure if your eero can do this easily but you probably want to use DHCP option 6 so your router will forward the DNS server you select to all clients. That’s how I do it on openwrt.