It's not covered really, as the air flow comes from the mouth of the bumper, hits the flat underneath of the panel and into the air intake area. It's almost the same concept as the carbon ones except that's moulded.
Don't forget there will be no or minimal air between the hood and bumper so all the air comes under and in via the panel. I sure it'd be fine.
I may still go ahead with doing these panels as a flat sheet doesn't need any moulding. I have a supplier for the materials, just need to cut and get them finished in a burnt effect.
Could run a quick taster of 10 and see how they go. Problem is titanium isn't cheap.