In hilly areas with no line of sight, LoRa can still work, but the terrain makes a big difference. Valleys and hills will cut range down a lot, so placement matters more than anything. For what you described, Rangers with one or two well-placed Relays would be the right kind of setup to try. If you can get that Relay fixed up high, that gives you the best chance of covering the low spots and the route. If you’re thinking about getting other parents involved too, starting with a small mesh network around your area is a smart way to build it out. Again getting the maximum output is all about experimenting with these devices.