I'm not sure the best way to run Central on the same machine that you are already using to host your website (if that is what you are asking) because Central sets up its own things like nginx and a database in docker, and those can conflict with existing webservers and databases on the same machine. I think it's possible to do it, but would require changing things from the default Central setup. Even though I work on Central, it's not clear to me what parts should change to accomplish this. This other post about Central's nginx conflicting with the host machine's nginx may have some clues.
It is also possible to run Central on a separate machine with a different IP address and have the subdomain point there. I think this is the "recommended" approach. That would require more resources (running another server dedicated to Central), but the Central setup would be straightforward, and if your Central server were to experience a lot of traffic, it wouldn't affect the main website. This part of the docs describes Central's performance on the specs of a low-tier Digital Ocean machine.