Thank you guys, you're brilliant. Seriously! I've been looking carefully at those threads suggested and I've been given plenty of ideas on how to proceed. Yesterday I spent a few hours in the car trying to figure things out. Eventually I decided to have the camera down from its upper-left position and for the time being I'll be using a suction mount salvaged from my car navigator museum and just put it smack in the centre of the windscreen as high as the wipers goes, just to see how I like it. I'm not that found in those suckers, I think they're too obvious from the outside, feels almost like a neon sign flashing Hey, look here!
Right now I'm thinking in either do me a magnetic quick release mount, and if possible add the contacts for electrical supply into the magnets somehow. Has that been tried? I have some spare connectors from my electric guitar I could dissect and re-use. Another option is of course those extension cables to the mobius lens. Either way, just for fun I probably will order me one or two of those to play around with and see what comes out of it. Can they be connected to each other to make an even longer extension?