Actually, some questions:
Would there be any benefit to making a panel to fill the inset area around the rear license plate mount? I feel like it’s kind of hair-splitting. I’ve ditched my windshield wiper deflector for the same reason, from what I’ve read it wasn’t that worth doing. Maybe it’s the same case with this, if air is even flowing over it all.
Second is just a continuation of my previous post. You can see that the grille area is inset quite a bit, and the bumper around it has a very irregular shape. I’m thinking a flat panel as a grille block there will either do nothing or possibly act like a parachute as it’s quite deep into the rest of the bumper. The lower area of the bumper has that difference in thickness come into play in the grille area, making it quite hard to try and get a block shaped to properly stream air along the bumper. Im not sure if there’d be a positive aerodynamic effect to covering the lower grille, lemme know if I’m overlooking something.