I want to install a dash cam, but I don't want to use a suction cup mount as I heard those fall off easily in the summer (when it gets too hot) nor do I want to tape the mount onto my windshield. Therefore I was thinking of buying a mount that can hang off the back of the rearview mirror. Has anyone heard of this and is using it? I'm just worried that by hanging it off the rearview mirror, it may block some sensors.