If you are prioritizing a camera that will do well in high temperatures, the Action 3 is definitely the camera to go for.
This video is proof of that
As for the mounts, they do have share the same mounting style as the GoPro mounts. It also has a time-lapse mode. From what I have heard you can run an external power source through the camera similar to the GoPros. Regardless, if you are looking for a camera that can stand the heat, the action 3 is the better option vs. the GoPro 11.