I've pondered this for a while now too. I want a rear DVR. Can't high mount in window because of the sun shading and it will in the rear passenger head zone. Low mount will be bad because of steep glass angle will have it located mid way up. I'm considering mounting to the rear glass off to the drivers side where I can't see it in rearview behind headrest. 12v switched power back there will be an all afternoon task too.