I have used the same Thule rack on two E90's and two F32's and plan on putting it on the M3 next spring.
It mounts into the fix points on the roof, so there is no contact with the car.
Other than some wind noise and a mileage hit, it is fine.
If my car can't carry my mountain bike or an occasional kayak, it is of limited utility to me.
For the record, the OEM BMW racks are made by Thule.
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