Multiple Controller Support Testing, and Gang Beasts

I'm attempting to set up 8 controllers to use in games like Gang Beasts.

Has anyone here successfully gotten more than four controllers to work when using game stream on any game?

I'm assuming the major limiting factor is Xinput only supporting 4 devices.

I have successfully set up four controllers, but more than that do not seem to be detected by most programs, and when they do they duplicate another controller. I have tried Pinnacle Profiler, Joy2Key + UJR, Antimicro, Xpadder, and InputMapper with no success.

I also get similar results using Moonlight rather than Gamestream

Any suggestions?