Re: Some interesting possibilities here...
I would expect, to be part of the trial...
* You have to live within 10 miles.
* Have a secure location where the items could be dropped off safely (secure back yard, etc)
* Maybe have a box that items could be dropped into to, or at least an agreed dropoff point, X marks the spot etc.
* Maybe even a visit from someone at Amazon to confirm things are okay.
Only those that pass vetting, get to use the drone service, at least for now.