By all means, mount a camera wherever you're comfortable with it. I rarely go out in winds over 15 kts, or in big waves. deck-height mounting might not work well in high wind or surf.

I have several videos, however, where spray off a bow hits the camera. It gives quite a sense of speed. I also have a near-capsize where the camera spent some time under water. That wasn't my best moment, but it's interesting to watch.

Treating the housing lens with rain-x helps shed water droplets, so they don't interfere with the picture.

Regards,
Eric