I certainly don't run 6 at a time, but even with just 1 - if it's doing anything visual - how are folks hooking up screenshots to self verify? And how do you keep an eye on it?
The only solution I've seen on a Mac is doing it on a separate monitor.
I couldn't find a solution here and have built similar things in the past so I took a crack at it using CGVirtualDisplay.
Ended up adding a lot of productivity features and polished until it felt good.
Curious if there are similar solutions out there I just haven't seen.