installed some RAM mounts "x-grips" and a gopro mount to the Vector dash bar I recently also installed.
One of the x-grips is for my phone (as shown in the photo), the other will be for passenger use or a yet to be purchased monitor for a yet to be purchased rear view camera system. I'm thinking of an 'always' on rear-view monitor system, and therefore would want a dedicated monitor. For the go-pro mount, I imagine I'll normally run it outside of the vehicle, but for those times I want to view from inside the wind-shield, this will do well.
More info on my blog
here, along with details of the Vector JKE dock. This is a very solid mounting system - no more window suction cup devices falling down while off road!
FYI, the cables hanging down are from a 12V outlet I have mounted above (there is a standalone GPS unit up beside the rearview mirror)... they hang down to charge my camera and other cell phone while mobile.