Guys, I would like a bike rack for my car (Polo hatchback). I don't have a tow bar. A good friend mentioned that the Thule rear mounted bike rack with the straps (note with the straps, Thule 910XT) scratches the car paint. He suggested I get the solid frame (eg: https://www.bikehub.co.za/classifieds/173185-thule-clip-on-3-bike-rack/). Please advise?