We have a special simulator build which can run several nodes in a single process, and this has been used in the past to test different topologies and network g

We have a special simulator build which can run several nodes in a single process, and this has been used in the past to test different topologies and network graphs. But yes, there's absolutely no reason that you couldn't stand up a whole load of VMs or containers and run Yggdrasil in each of them to play about.