You'd have to tweak the app code I think to achieve your single device approach. At the moment the parameter in the Webhook sent from tinyCam drives different virtual motion sensors as you know. So you could tweak the code to interpret these events instead to drive a single device I suppose. Depends really on your end game, whatever you are trying to achieve. Maybe keep it simple as it is now and use Rule Machine to drive other automations?
I didn't run into any certificate issues with tinyCam so I don't think I can help you with that, sorry. Hope you get it resolved. Please keep us posted on your progress!
