What year? If it's a 99+ model, is it supercharged?
It hasn't been a problem yet for me, I've only been pulled over once and got
a warning. If it becomes a problem, I'm going to add a pair of L brackets
between the intercooler and the frame to temporarily mount a plate.
There's room to do it, but not a lot...
I know someone who has fabricated a Saleen-specific bracket that allows mounting the license plate without drilling holes into the front of the bumper cover. He is not in the parts business but I believe he made a small batch of the brackets. I have one just in case I need it someday. PM me if you want more details.
Here's how I mounted the front plate on my car, using the back side of the front valance. It sits about an inch in front of the I/C radiator. So far, I/C temps have not gone above 160.
The local police like to do vehicle registration checks, so I need the front plate .