Usage of custom domains on nginx

I'd love to be able to use a custom domain on the Ultra.cc nginx server. It will be able to provide benefits such as:

• Being able to configure proxies (e.g., Cloudflare) to cache certain content and provide further security, therefore saving both upload bandwidth and exploit attempts.

• Being able to bypass any firewalls that block Ultra.cc domains such as usbx.me for any reason.

• Having both email and seedbox on one domain, so example.com can lead to Jellyfin, as well as a mail server.

• Not being limited to a subdomain and allowing users to manage DNS for other services, to work alongside their seedbox all on one domain.

Would love to know everyone's thoughts on this. Thanks!