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[jfb]

You have some options with routers.

1. If they don't play nice, then use Pi-hole for DHCP and disable DHCP on the router.

How do I use Pi-hole's built in DHCP server (and why would I want to)?

Using Your Existing Router For Network-wide Ad Blocking You might not need to use Pi-hole's DHCP server: In many home environments, your router also functions as your DHCP server. In this case, you can often set Pi-hole to be the DNS server for your network clients in the router's DHCP (or LAN) settings page, which allows all of your network clients to block ads simply by connecting to the network. Setting it up this way is also what makes Pi-hole very powerful for network-wide ad blocking. …

2. If you can't disable DHCP on the router, then try restricting the IP range of the DHCP to a single IP address (the IP of the Pi-hole). Then enable DHCP on the Pi-hole on a non-overlapping IP range.

3. If you want to keep using the router DHCP, then start with disabling IPv6 on the router. IPv6 can result in DNS bypassing Pi-hole.