I tested it on LFL. There is an option in the admin panel where I can enter my twitch stream url and key and it seems it to the shosho backend. I tried it with twitch only. I didn't bother with YouTube or Rumble, but I'm going to assume that it will work because the LFL and ShoSho seems to be using the same backend software. I usually stream forward to using LFL to twitch, rumble and YouTube and usually works fine. YouTube sometimes has issues, but rumble seems to always work. Your backend doesn't show up on the zap stream website, only LFL. I don't know why.