And that has little to do with the Corner Shot. The fact that recoil means you have to reposition the weapon each time you fire is handled perfectly well with the requirement to take an Aim action. It's not a particularly complex toy - you mount the gun in the resally obvious place, turn the joint and turn on the camera.
Not talking about recoil. Recoil has little or nothing to do with your first shot. Proper hand-grip, breathing, squeezing of the trigger all matter more. Is there a picture of this rig? Unless it locks into place or is mounted on a tripod, all the things I mentioned come into play when firing a shot from a gun. Enough training makes most of this instinctual, newbies of all stripes (barring a 'natural') usually have to be shown how to do all this in the proper order. Holding your weapon incorrectly can cause all kinds of problems with accuracy.
Followed the link...yeah, imo that weapon does little or nothing to help a 'neophyte shooter'. All you've really got there is a video sight picture. Not gonna help you if you jerk the trigger as you shoot.