They guy with the factory (US) hitch and no notch had his hitch pushing up against the bumper (hence the notch). Whether or not it will cause and issues in the long run, who knows (It's possible that cracks could develop right there from movement of whatever he is towing). As far as the curt hitch hanging under the bumper about half an inch; this is how the OEM hitch for the eu model sits (which is also rated for higher towing), and I don't see why that would be a bad thing. If you get the curt class 2 hitch it's sit's slightly lower than the oem (US) hitch, just enough so that it is not putting pressure on the bumper without having to cut it.