All interesting insights & information. The height of property isn't clear and hasn't really been challenged in court "pertaining to RC or Drone" to have any legal precedence, and that leaves it up to interpretation per locality by the Local Police or Enforcement (LEO). If polite conversation doesn't conclude with LEO in a friendly agreement, I'd pack it up and apply a different tactic with authorities later and not push the LEO's street justice that you're certainly going to loose. The type of pilot, being a PT107 or Hobby technically doesn't apply on the trespassing or altitude above private property, in these matters they are the same. Actually in situations of legality, the PT107 would have additional rules or procedures to follow and the Hobbyist has more relaxed requirements... under current, but that may change under the new standards being introduced beginning with Feb 2019 going forward. Example; night flying for capturing July 4th Fireworks, the PT107 requires a night waiver, the Hobbyist needs to simply contact local tower to "request & inform" evening flight... and I believe meet the night visibility strobe light rules.
The height above property that I have concluded generally accepted by "informal" conversations with local law enforcement that deal with the complaints is 25-50 feet above the highest point of asset property, not a 120' HAM Radio tower or 100 year old 150' tree. If acreage or farmstead, it applies to the farm property, not whole farm including the pasture or farm ground.
Like indicated above, at minimum I have a bright neon shirt with my logo on Ft & Back, I make all attempt to be very courteous, provide a business card if nothing else to provide my name and contact. Also on the back of my card, I've printed a condensed set of statements basically indicating FFA, damage to Aircraft, and Personal Property. I'm receptive to requests not to fly over their property if they feel uncomfortable in their back yard. I often take a few quick stills of the landscape when starting the flight, just so I can show how small people or faces look in the photo. I don't directly offer to show my videos or flight logs... don't provide evidence if you don't know how it may be used & challenged. If I need to fly over their property, I ask if there would be a better time to get the neighboring image... suggesting after they move in from the back patio. On the few times local law enforcement has arrived, I'm friendly and willing to show the video stills and flight logs if requested. Actually, maybe it's the mid-west but I haven't encountered police resistance, they recognize I'm not being challenging and normally agree if I keep it above 25-50' above roofline there isn't any trespassing or peeping tom concerns and will often relay that to the neighbor that made the complaint. They'll often ask questions of interest, which I encourage so the neighbors feel or view I'm comfortable with the police.
My 2 cents opinion, if you're courteous and receptive to conversation, offer information about yourself, and offer a little view into what you're capturing it goes a long way to calm the situation. If during that conversation, you perceive it's still a challenge... I'll often suggest they take a minute to look at my contact information and note the back of the card, and if needed call the police. The few I've taken to that degree, basically "give me the look" and walk away with the attitude that they held their ground but they're not going to challenge me since I'm not encouraging.
As an example, the back of my Contact Card...
Intended to be informative...
