Which gopro mount would be best for a cliff jump?

I'm doing a 25' cliff jump into a body of water below and I want to use my gopro, but I'm not sure which mount would be safest so I won't lose my gopro. I have/can get any mount. Which one would be the best balance between a quality shot, and secureness. I was thinking about the head strap, I think it might slip off when I hit the water. Which mount would be best?

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