Installation isn’t complicated, but it would be nice to have some reference points as to exactly where they are be positioned. They cover the main openings as well as smaller ones nearby to completely seal the door panel, but getting the orientation just right before drilling holes for the screws is a little tricky. I would drill two holes while holding the piece in place and then put the two screws in to locate it before drilling and adding the remaining screws. Was going to add component speakers to the front doors, but decided to hold off and I’m glad I did. These plates and some sound deadener completely corrected the lack of bass from the factory Bose speakers. I also added some thin material to better seal these to the doors. I couldn’t feel the bass at all from any of the door speakers prior to adding the panels, but that isn’t the case anymore. Extremely pleased with my purchase!