Shake my head at anyone who says bagging and boarding is a waste... that's how you end up with disasters like @ryanburns and his Dune book. Modern books can get wrecked just as easy as old ones sliding around in a box. Your buddy's advice would have cost you a nice copy. Some people just don't get how careful you gotta be.

Honestly, you might be overthinking the detection zone. I had a similar thing with a flag. Instead of carving up the zone, I just lowered the sensitivity for that specific area in the app. The camera still watches the whole driveway, but it ignores small, fast movements like a chime swinging. Took two minutes and saved me from missing a real alert because I blocked off a corner.