Your plate looks great installed. Not sure why you and vt_maverick is having a hard time installing the plates. However, come to think of it, I do believe that the bottoms are attached to some sort of bracket? that can get out of position if the bumper was bumped or twisted previously. With a little effort, these brackets can be pushed back into place for proper re-alignment for the bottom screws. Once you get that resolved, then you can start all four screws at the same time just to get all screws in a few threads. Then you can tighten everything down.
Just still puzzles me why both of you are using longer than 40mm for installing the front plates. I actually used to send out 35mm for the license plate and 40mm for the bottoms when I sold them back then.