I've been messing around with various camera mounts on my equipment from head-cams to kayak-cams with limited success. The head-cams seem to work ok giving you an interesting perspective on the rivers I run. The kayak mounts have been hit and miss. I've built a few different towers that attach to the kayak at various locations. Some have been tall, others short, yet in the end none have been worthy of keeping and using. For one reason or another, they break, bend, or just get in the way. Imagine a long tube sticking off the back of your boat. When you flip it'll either break off thus being dragged behind you, or it'll get hung up on rock mid-rapid. So I decided to try something different. Rather than attaching a tower to the kayak, I decided to mount the camera hardware directly to the safety grab loop of the boat. After some drawings and R&D, I ended up buying mounting hardware, drilling a hole through the safety loop, and mounting the camera. It was a lot easier than I thought and surprisingly stable. I went down to the local play spot and thrashed about in our play features to see what would happen to the mount. It worked perfectly! So the next step is building a small stand for the camera and mounting it to the kayak in similar fashion. Pretty simple yet effective. The only drawback I can see is that the hole in the safety loop decreases its overall strength . In essence it creates a breaking point mid safety loop. There are others to clip to if needed and building a self-equalizing anchor point through all safety loops would be ideal.
Check the pics out.