It’s not so simple. Height and terrain is really important for that distance due to the curvature of the earth. Ideally both antennas are elevated above the terrain by at least a couple hundred feet, wherein you run into structural legal issues.

Correct. When ypi start to desire these types of ranges with these devices it becomes very challenging.

The higher you go, the higher your probability is of getting better line-of-sight But again, now you get into your own height limitations, terrain, let alone what physical height limits you have for your jurisdiction. Most places you can't build anything higher than the local water tower, or flying zone limits, etc.

Do you or anyone you know know of jurisdictions that have been able to convince public entities like fire houses or water towers to install a device for someone or is there too much red tape and access for updates would be hard?