the Teamspeak3 licensing page lists the free version as 32 slots, 1 virtual server.
Is it allowed to host multiple TS3 servers on the same physical/virtual machine?
I am not sure since you can get 2 licenses and have 1 license cover each TS-server?
It is not allowed to run several of these free instances on the same root server. If you need more than 32 slots or several virtual TS3 servers, you have to register the server.
You’ll need a license anyway to run multiple servers on the same machine.