How to test Octo

We are trying to test octo. We have 2 JVBs set up, along with jitsi torture / selenium grid that can create up to 16 nodes. What I’m wondering is if there’s a way to create a meeting with 16 participants, and some how configure the system so that Octo kicks in and forces each JVB to only handle 8 participants.
or … is there another way to test Octo?