I don't have the Camrig, I have the Noir Matter which is similar:
https://noirmatter.com/products/kite-line-mount
Basically, every time I self-launch with this mount I crap myself, but like with everything else in kiting it gets more routine every time. Like the advice above I prefer to use an anchor when using this mount (stress eliminated), but that's not always possible with certain wind directions. If not anchored, I rig the lines upwind to have it laid out, and I have also drift launched it in lighter winds.
When drift launching it you can grab the center lines above the bar to keep it from tangling, and I always have one hand on the safety in case I have to release.
You have to secure the mount to the stationary line (non-safety line) with another string in the event the mount pops out of the lines - which has happened to me once on a self-landing when I had to pull safety.
Also worth mentioning is that I only use this mount on my low-V kites - never on the high-Y kites - although I have seen other people use this mount on high-Y kites. On the low-V kites, you can reach up and grab the center lines above the bar, pull in and power the GoPro on/off and deal with any mount issues. With high-Y kites, you're stuck with how you left the beach which makes things more risky.