My Unity Game on my CentOS Server

I want to create a simple cheap to operate 50 slot multi player racing game server with unity that i run on my atlantic net CentOS server. Is this possible? Can anyone recommend a third party multi player network plugin? I have no interest in using unity network or photon.

you can check forge, which is pretty active in development recently with version 2.0 in beta.
it have unlimited ccu and can build linux headless server