The action camera market is massive and I have come late to it.
Not wanting to spend too much on a camera in case it proved to be a fad, I bought this Denver AC5000W.
It comes with loads of accessories and a waterproof case. To that I have added a RAM ball with a standard camera screw mount.
I've tested in the house. This model comes without a screen on the back but a wifi link to my iPhone and an app. The app allows full functions to line it up and start recording.
Just need a bit of sun to get out on the R3 to test it.