@Mary Brown good question, and honestly a really relevant one for ag deployments specifically.
The 50km figure is drone-to-drone with both units elevated and zero ground clutter — so yeah, that's the ceiling. The ground-to-ground spec is 5km under more typical conditions, and that's the number I'd actually anchor your planning around for a surface-level deployment with obstructions in the mix.
That said, your setup sounds more favorable than a worst-case NLOS scenario. Tree lines attenuate 2.4GHz but they're not brick walls — you'll lose some margin but you're not falling off a cliff. Metal grain bins are more of a concern because they reflect and scatter rather than just absorb, so you might get weird multipath behavior near them rather than a clean range drop. The farmhouse in the middle is actually where I'd think about placement — if you can get even one node elevated a few meters (rooftop, a pole mount), you recover a lot of that lost margin because you're clearing the near-ground clutter.
For your use case I'd honestly expect comfortably usable links at 3-5km through partial obstructions at ground level, potentially more if you get any height on the endpoints. If the property is large enough that you're pushing past that, the mesh capability in the Connect app is worth looking at — you can chain nodes through intermediate points rather than trying to punch one long link through a lot of vegetation.
What's the rough scale of the property and are the monitoring points fixed locations? That'd help narrow down whether you need a single long link or a small mesh.
