I drove around for over a year without one - no issues but I also still had that dealer registration sticker in the window which may have helped. After my OCD kicked in and I removed the sticker I didn’t want to deal with the worry/hassle every time I drove by a cop so just got a Carbonio holder and have never looked back.
https://carbonio.com/products/bmw-m-...se-plate-mount
I have one of those personalized black/yellow plates too with a black frame and have blacked out the car trim so to me actually looks decent with the front plate on a LBB.