See the solution by @vgaetera in Post #2. You'll have to SSH into your router. You'll also only have one MAC address instead of the two – replace the line with the contents "MAC_ADDR1 MAC_ADDR2" with your single Raspberry Pi's MAC address.
This will not redirect your DNS queries per se, but instead it blocks standard DoT and normal DNS queries over port 853 and 53 respectively. It will end up forcing your device to use your LAN's declared DNS server. Further details, including limitations are in that thread.