So with no vpn on you need to bind it to your IP address ( If you don’t have a static IP address and your ISP uses Dynamic you may need to do this 1 or twice a month) once that is done I have AdGuardHome v0.107.6(latest version) doing dns. DNS servers are Nord with Cloudflare as bootstrap. (I used my roku Mac address) Go to settings in AdGuardHome and choose Client Settings add client to persistent clients list. Fill the info for each tv or steaming stick. Before adding the client,the last options are settings, block specific services and upstream DNS servers. I added the Nord Smartproxy servers to the upstream DNS 103.86.96.103 and 103.86.99.103. Clear the Roku or tv cache if possible and you may want to delete the network and re-added it to clear things out. You may also need a router reboot.
You may also want to add static IP address to your TV/Streaming sticks
If you do it in LuCi the best way is to create a TV/streaming only network with the Nord Smartproxy as DNS