I hear you. Best to be safe. I'm just treading carefully with this. I want to be 100% sure before I attempt any connections. I will test them with a multimeter. Hoping to DIY else I will get my electrician in.those black wires are neutrals (or very well should fcken be). I dont really mean to be funny though but if you aren't really sure about this kind of basic its prob not best to play around?
Would like some insight as to how the wires should be connected to the Shelly device.