TL/DR: My advice: when tightening the fasteners on the roof rack, pay attention to the portion of rubber feet above the glass. If they touch the glass, stop tightening and back up a little.
I have a 2020 M3. Love the car. Happy that I can use it to transport bicycles. I like the OEM roof rack. Do not love the installation instructions.
I screwed up the second time I installed it. The first time I was super cautious and was successful - carried a bike successfully and everything. I had to remove the rack for some reason. The second time I installed, I decided to use a torque wrench that I have for bicycle work. I recall seeing instructions to tighten to 5 or 6 N*m. "Perfect! I have 5 N*m torque wrench - I'll use that!" Bad call on my part. Either my torque wrench is defective or the instructions are. Maybe I only imagined those instructions. Anyway, I get to spend ~$1300 on fixing the roof.
I have a 2020 M3. Love the car. Happy that I can use it to transport bicycles. I like the OEM roof rack. Do not love the installation instructions.
I screwed up the second time I installed it. The first time I was super cautious and was successful - carried a bike successfully and everything. I had to remove the rack for some reason. The second time I installed, I decided to use a torque wrench that I have for bicycle work. I recall seeing instructions to tighten to 5 or 6 N*m. "Perfect! I have 5 N*m torque wrench - I'll use that!" Bad call on my part. Either my torque wrench is defective or the instructions are. Maybe I only imagined those instructions. Anyway, I get to spend ~$1300 on fixing the roof.