[ivv]

Maybe residents would place beacons where they want the drones to land?

[glitchc]

Indeed, the beacon is a landing pad that customers place in their front or backyards (ideally back). See (3) in the following link:

https://www.digitalspy.com/tech/a820748/amazon-prime-air-dro...

As for which house, that's via geocoding (convert postal code to GPS). Reasonably accurate for North America, unclear about other parts of the world.