Contour went belly-up - I always seem to pick the gear of future-defunct companies, but the only useful fishing mount from them that I found was the headband mount.
For the GoPro, there are many mounts. The two most useful for fishing are the headband mount, and they also have a chest mount. The latter may not work as well, depending on what you carry your gear in. But, you wouldn't get every twist and turn of moving your head as you fish.