said crazy guy has had his on for thousands of miles with no issues at allspace under panel on hood will cause air to want to be yanking the hood up all the time IMHO. You will have to reinforce and or add more hood hold downs. As to parking in sun.. yeah that can be an issue. But who says a permanent panel cant be tilted when parked. add some hinges, levers, arms or how ever you want.. to allow it to tilt along with ways to lock it down in travel. IMHO..... what we need in this world of ours is awneings. made of solar panels.
oh... and bunjee or ratched strap a panel on the hood for testing also. ESPECIALLY on a bright sunny day to see how much and when the reflection is going to be an issue.