This photo shows the bike support on a Toyota Aygo 2014 -  with bumper on with a 13 pin plug. When you get a bike support without a tow ball you will require a 7 way bypass since its covering the rear lights. 

This is the tow bar mounted, we take the crash beam off and use the two existing slots to mount on to with m12 bolts with nylocks. We take the crash beam fully off since it's in the way of the tow bar mounting but keep it to give to the customer in case they want it refitting. However the crash beam only held on by 8 m6 bolts.