Clodo:
The objective it's making a single Tor Relay and using on the machine many daemons on a multicore server. I hope someone can give me a feedback if this kind of configuration can be problematic for Tor network before test in a real environment.
there can only be a single tor instance at a given IP:ORPort because tor clients expect a specific tor relay at that location (public key as defined in consensus)
you can simple run 2 tor instances per public IP using different ORPorts