I tried BigBlueButton on a bridged Virtual Machine (Ubuntu 16.04 Lts) in my laptop: the setup with bbb-install.sh worked very well. Before the install I opened all the required ports.
BUT we are behind a Nat and this is the only real issue: I think I had to setup a Turn server, which I would have gladly avoided… 
…now that you tell me about jitsi-meet, I’m gonna try that, too.