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With a 2nd RPi-3B+ Pi-hole for redundancy, network clients will use the secondary Pi-hole should the primary fail. Neither Pi-hole will be running DHCP as that will be provided by a UniFi USG. Each Pi-hole will be assigned a different static IP address. The USG will also be configured to only have both Pi-holes listed as DNS servers.
I’ve gone through the community posts, but couldn’t find a post that didn’t exactly match what I’m trying to do as most have their Pi-holes also running DHCP.
My question is: Are there any other settings, other than having unique IP addresses and both Pi-holes listed as DNS servers on my USG, required to make this work?