Gotta say, I'm a bit worried about this. I placed my order a few weeks ago, and although I have a somewhat steep driveway, I did not get the air suspension because I did some measurements and figured that 6 inches should be enough ground clearance. It's not clear how much these additional plates are going to hang down, though.
If numbers come out and it looks bad, I wonder if I'll be able to call the factory and opt out. Given how unnecessary the extra plating seems to be, I'm also a bit reluctant in general to accept a heavier car. Even if it only affects range by 0.1% like Elon says, extra weight could mean higher registration fees (and increased tire wear too, I'd imagine).