Yes I still have the black sticker, but you can barely see it and it blends in nicely with my EZtag toll thing.
For the bracket/mount I would suggest trying some of the HD magnets so you do not have to worry with punching a hole through your roof panel. I still think that mounting it this way would not be as beneficial as just moving it as far up as we both have already done. Maybe it is worth a try or a mock-up, I still don't see it sitting flush with the headliner if it is attached to a plane that is perpendicular to that surface therefore sticking out (down from headliner) a little too much..... Just a thought