I have a Broadway mirror also and have been trying to find a way to get a Mobius behind it without the cam sticking out like a sore thumb. I'm about to give up and just give something flat like this a go. I was going to try double side tape it to the back of my built in rear view mirror but this would be alot easier to pull off and on.
Question on the angle of the camera though. Since you tilt it towards the driver side, do you still get a wide enough field of view to catch action on your far left driver side? Now that I think about it you could probably add some sort of foam to help angle the cam before strapping it down.