As the originator of the "California front plate blues" thread, I appreciate all the discussion and also offer an option.
I drilled a couple of 1/4" holes in the plate and the "lower lip" of my '97. I folded back about 1" of the bottom of the plate and mounted it to the lip with a couple of 1/4" X 3/4" round head machine screws. I've been running with this setup for a couple weeks, including two trips to the desert in 95F+ weather and have had no overheating. You can see the car at: