I have someone wanting to block western sun from their entry hall. The door has a small half circle window, then a 7″ wide “side light” window on each side of door and then a “transom” window above that extends across the door and side lights. Glass is all frosted. I intend to use semi-opaque sheers 3X width with blackout lining between sheer and glass. One book suggests mounting all on board and securing to inside of facing with velcro. Another would be using screws into this metal door. I really don’t like either. Can someone tell me your experience? Suggestions anyone?