I’m not the guy you asked but I do the same thing. In the tailscale dashboard you can set up a default DNS for every device that is connected to your tailnet. They support nextdns and a couple other things. I have mine pointed to my personal adgaurd home server that is within my tailnet and it works great. I used nextdns for a while but didn’t want to pay for it. It also worked great with tailscale.