I dont think we can agree on this one, I have a very different view.
Eventhough the GoPro and similars are marketed as "POV" cameras, meaning "Point Of View" like you see it yourself, I find this angle by far the most boring and worst of all.
So chestcam or mouthcam or helmetcam, is rubbish (IMO)
When you get a GoPro you think - Aaaah, now I can show friends and family what it is all about
And when looking at the footage for the first time, you are so dissapointed you will hardly share it...
Waves looks ridiculously small and TT jumps not high, because of the wideangle and viewangle from you
I find a linecam with a GoPro with a high or medium high V works the best.
A low V and you can not see much except yourself, and you might have to use the extreme wideangle that distorts the edges so no good (IMO).
An example with a relatively high V and GoPro in linear mode (as always) at a local spot here:
But simply different likings I assume
A few from CapeTown this year, same relatively high V and GoPro in linear mode:
Glassy at MelkBos
And a day with HUGE waves
For wave(size), a kitecam (not a linecam) without wideangle works by far the best, but that was not your question.
kitenight11, 6 meters is fine, or more, dont go closer is my advice