Is it possible to login to Plesk through any hosted domain?
Yes. Even if the server has many assigned IP addresses, each domain which hosts on the server can be used to login to Plesk at 8880 or 8443 ports. For example, server hostname is server.tld and it has domain example.com. So, Plesk can be accessed both via http://example.com:8880 and via https://example.com:8443