I’ve only had problems with key fob presence sensor, on s8+ note 8, s7 edge, and v20 presence works pretty darn well.
Only problem with that is if like you said, just at neighbors, depending on how close they are could be a problem. Even at it’s best a phones GPS is only accurate to about 3m. Can adjust radius in app but 15 feet could be difference between your living room and your neighbors.
I set it up at my sister’s so that it uses WiFi to determine whether or not home, if connected then home if disconnected for x number of minutes then not. Each way has flaws.
I can’t go ANYWHERE without my phone, my kids can’t either, so that’s not really a concern for me…unfortunately.