Does anyone know of any anti-slam products for interior doors? We’re trying to quiet down the upstairs of our open-floorplan house. We’ll be replacing the hollow-core doors with more substantial foam (Premdor QuietDoor or similar), or solid wood doors, but our 5-year old can slam his door quite forcefully. Is there anything that can dampen or prevent door slamming? We’d like to do what we can while we work on the behavioral side of things….