Regarding microwave towers, if the towers are at the same height and they point at each other, the elevation angle of the beam centerline at each tower will be slightly negative to account for Earth curvature. Very small angle. Probably well within the error budget of the alignment. (It looks like they use phased arrays, so there is no mechanical pointing, just a reach-out-and-grab approach.)
You can't prove anything with microwave towers. I could glue two pencil stubs to the surface of a basket ball and string a line from the tip of one stub to the tip of the other stub. Just like a microwave link.
Regarding microwave towers, if the towers are at the same height and they point at each other, the elevation angle of the beam centerline at each tower will be slightly negative to account for Earth curvature. Very small angle. Probably well within the error budget of the alignment. (It looks like they use phased arrays, so there is no mechanical pointing, just a reach-out-and-grab approach.)
You can't prove anything with microwave towers. I could glue two pencil stubs to the surface of a basket ball and string a line from the tip of one stub to the tip of the other stub. Just like a microwave link.