Is there an Roon endpoint that supports multichannel?

It does work. I have done it. My end point is an Asus version of the NUC 250 gig drive 8 Mb of ram. On this I am running Windows server 2016. Roon server is running Win 10. With Windows if it does not see the hdmi on bootup it will not be an option. So if you have a setup like mine or less complicated, if you are listening to “standard” two-channel and then want to go to multichannel you have to reboot the “endpoint” or the Roon server. The is the only downside I have seen. I also run it through an Anthem Surround processor. Good Luck