This GoPro mount makes a 90 degree angle while rotating the camera 90 degrees as well. This can be useful when taking shots perendicular to you or the object where it is attached to. (e.g. in combination with the shoe mount). The size and price is identical to the standard 90 degree angle mount.
I try to use and test the accessoiries myself, however feedback, improvements or special requests are more than welcome. You can always contact me with ideas or questions. New products are added to my shop once in a while, so keep around for some fresh new stuff!