I thought I would try an under mirror GoPro mount. I purchased a small sheet of 16-gauge steel from Lowe's and cut it out with a 2" diameter on one end to mount under the mirror and a 2.5" diameter on the other end to mount a 1" RAM ball. I painted the mount flat black. My only real concern was shaking of the camera as the 16 gauge steel is not very thick. I could go thicker but with the three 6mm bolts holding the mount, the camera, and retaining the mirror itself, I was concerned that it might get to be too much weight. It turns out the GoPro has built-in "HyperSmoothing" technology that seems to remove any/all shaking from the video. I am actually pretty happy with the set up!