Yes, you set the client to the IP or host name of your server. The server's IP has to be reachable from the internet.

https://github.com/techahold/rustdeskinstall Or if you are using Proxmox VE https://community-scripts.org/scripts/rustdeskserver

Regular screws are your easiest option. If you wanted to complicate matters and be fancy, use rivet nuts, but you'd have to figure out what size your screws are, and they'd probably not be long enough. https://en.wikipedia.org/wiki/Rivet_nut