So I tried to install the grille badge the other day and I noticed that the threaded part is too short for parts of the front grille, and for the part of the grille that it does fit, because the badge and the back part that screws on are both smooth metal, it is very difficult to secure the badge to the grille without causing damage. Also the part that goes behind the grille is also very short so it doesn't always securely fit square between two of the grille posts. I will likely figure it out by both getting a longer threaded part and add some sort of waterproof foam so the badge doesn't slide about and to protect the grille itself. But overall it seems there is a lot of difficultly securing the grille badge to the F15 kidney grilles without some modification for the badge and/or attachments.
The kidney grilles are deeper than other BMWs. Some people mount them on the lower portion of the bumper.
I'm also looking at alternative locations for the grille badge but if I go lower on the kidney grill it will seems too busy in the front as I already have a BMW CCA [NY] club license plate.