When I put my parking sensors in, I mounted the LCD display above the mirror (similar to MartynV8's) and ran the cable behind the edge of the headlining, simply pulled the door seals down fed the cable in past them, unpopping the A & B post covers and then ran it down inside the C post & behind the sub box, to the control box which I mounted next to the CD changer, handy for the NS.reversing light feed. Easy peasy. Depending where you want to put the camera screen, you could run the wire down the A post to the dash.
(Sorry - late post, just seen that you've got the rear ones done.)
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Well, bit late as I've done it now and today I put sensors on the front! I'm still undecided where to put the screen for the front. The rear one is on top of the high-intensity brake light and looks like it has always been there. I ran it under the trim to the top and then down the outside and back into the car where the towing electrics come through. The front one is quite unobtrusive so might stick it behind the instrument binnacle somewhere - easy to glance down when looking forward.
 

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