I have not seen hood lift at freeway speeds. Definitely no more wind noise. A bit more engine noise now.
This area of the fender is a fairly neutral pressure area ( see other posts on this topic) meaning it does vent heat once positive air pressure builds in the engine bay.
I am thinking there is enough room to fit a
small 12V blower fan above the battery as well to provide ~30CFM of active airflow even when stopped. Haven't determined yet whether same is actually necessary....