The cable and mount look just like it looks in the pictures...the mount comes with some little cable clamps if you want to be obsessive about it for the little run behind the screen, but they really wouldn't add anything, it is very stable as is.
Routing into the USB compartment is shown again here - I just enlarged the hole where the cover hinge rides, ever so slightly, enough to get the microUSB plug into it - it goes to the outside, just under where the side trim can be pried up, again ever so slightly, with a spudger - I use a plastic spatula...
It all is pretty invisible from anywhere your eyes actually would be...