Thanks Wiggy, I'll give it a goI have installed front and rear cams in my B-max.
You dont have to remove anything, except for the glove box IF you're going to hard wire the cams.
Simply peel back the rubber weather strips at the top of the doors and tuck the cable under the roof lining and tap the weather strip back into place as you go. You can even run the cable down behind the trim on the "A" pillar to keep it out of sight.
Running across the top front of the screen is easy, just tuck the cable in behind the liner. A plastic pry tool may come in handy.