Bite the bullet and buy a Thule rack that fits on to your towball. There is a 3 bike one for sale on this forum at a reasonable price and get most or all of your money back by selling your existing one.
The Thule ones are very stable, much easier to fit and the bikes are more secure on the rack and they can be locked on. It can also be locked on to the towball and can be lowered for access to the boot/tailgate and comes complete with a lighting board to keep you legal when the bikes are on and obscuring the cars rear lights.
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XC60 2013 D5 215 SE Lux Nav geartronic
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