I have added a photo for you from the instructions showing the location where the base plate arms protrude on your 2012 Mini Cooper Clubman after installing the Blue Ox Base Plate Kit # BX1307.
As you can see, you will have to trim the chrome piece on your Mini so the arms have a place to extend out for the tow bar to attach. Speaking of the tow bar, you'll need that along with the wiring and braking systems to flat tow your '12 Clubman, and I'll go ahead and list out below what you need:
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