My Setup:

OpenWRT Router: wireguard server

NAS: DNS Server - pihole

VPS: Client - Endpoint 10.1.99.0/24, 192.168.2.0/24

Phone: Client - Endpoint 0.0.0.0/0, ::/0

10.1.99.0 clients can talk to 192.168.2.0 clients and back and forth. The NAS can talk to anyone, anyone can talk to the NAS. Any new client can talk to anything.

They all use the NAS for DNS, so they all resolve hostnames and domain names.