Been using Namecheap for a decade or more now. Great company, no muss, no fuss, just works. The greatest thing is that they’re boring as fuck. That’s one of the best qualities to have in a domain registrar.

Highly suggest putting Caddy on a machine, forwarding port 443 and 80 to caddy, and then letting it do your reverse-proxy stuff. Register a domain name, give it your IP address, and then tell caddy that ‘immich.yourdomain.bleh’ goes to port 78789 and plex goes to ‘media.yourdomain.bleh’ port 89898 – Caddy handles all of the TLS stuff, handshaking, you name it - so you can have secure sites with proper certs.

Then make sure those things are isolated from your home network through vlans if your router supports it.

You can get fancier with it using a tailscale and getting some datacenter IP to forward into your network