I have just fitted a set of Dolphin Rear parking sensors. I did not remove the bumper and Mr Honda had kindly left a couple of holes already conveniently sited to pass the wires through. I put the 'brain box' at the very rear of the spare wheel tray but when I replaced the plastic finisher across the rear sill it obviously pressed down onto the connections in the box, which interfered with the workings. Small alloy bracket sorted.
Next job is the front: When I have found out how to remove some of the trim!!!!
I know there are those that think front beepers are a waste but my Wife several years ago, in a supermarket car park, just touched a Nissan Micra in the side, Rover nil Micra £700. Pea shaped and size dent by B post. No scratches, no paint loss. Spoke to our insurers about the so called amount of damage to Micra. Reply: these days Insurance assessors cost a fortune ( are they independent self employed? ) so we can't afford to challenge SMALL BILLS!!!!!!!!!! The bill was reduced to about £400 but I still think a rip off. So front beepers should solve that problem and might help with the front bumper being low and supermarket kerbs delightfully high.