Actually I have the motorsports edition, I used to race in vintage races so that's what I bought it for.The different GoPro's are all the same, they all come with the housing and 2 rear doors, one for waterproof (less audio) and one for dry (better audio). You always have to use the housing.
You can buy all the attachments separately and they all come with the adhesive mounts so buy the cheapest and buy any extra mounts you may need. For some stupid reason the anti fog inserts don't come with the surf edition so you have to buy them separately.
Yeah some concerns, you can see twice in the hull shots video how the water would bend it down. We tied the camera to the shorter cable going from the hull to the forestay just in case. But those adhesive mounts are really good, if it breaks off its gonna be from somewhere else.
I still watch that lower hull, specially with the chop I sail in but it gives me more peace of mind and well I've totally sunk that leeward hull and it still comes back. It basically makes pitchpoles less sudden, you really have to be pushing it and really ignore what's going on to flip over. I guess the simple answer is that they do work as they buy you some time but you can still flip over with them.

The angle of the hydrofoils is steeper than the angle of the edge of the hulls.
Installation is pretty straightforward, the mast has to be down. The screw that holds the "bow tang" is the same that holds the hydrofoil. It comes with a new longer screw but we used 2 nuts. One for the tang and a 2nd one for the hydrofoil.