I setup AdGuard DNS on the network I host my services on and made Tailscale use it as a second DNS. This let’s me access services using domain names. I’m sure you can do something similar with zerotier but I’ve never used it.

Also, it doesn’t have to be AdGuard DNS. Any DNS will be fine.

https://tenekev.com/posts/internal-dns-for-your-tailscale-network/

Solder it mate.

I knew you were going to mention nix before reading you post.

I’ve tried doing that too but the delay was far too much, around 3-4 seconds and the bitrate was so low it looked like a 480p stream. How did you set your proxmox?