In a lot of these places the best option is 4G. In a previous job we setup a small area with 4G internet and it was both faster and cheaper than what BT was providing.

Massive farmhouse and surrounding buildings that had all been converted into separate homes, not sure exactly how many people lived there, somewhere around 15 or so. There was also a functioning farm there as well which was why we set it up, the total LAN covered an area like half a km wide. Connecting everyone up with 4G was a cheap side benefit to the main project so it only cost like £100 extra.