Rear tint is a pain to install apparently but not impossible. Since the seats do not go down on the Quadrifoglio and since you cannot remove the headrests it is difficult. Better news is the windows don't contain of of those weird dots often found in BMW so the process is a lot cleaner cut/finish.
Attached are pics of the process. I went with MD Legal 38% (Stock windows are dark so 50% was applied resulting in 38%)