The arrays could be placed so as to cast minimal shadows on earth. The moon orbits the earth, but rarely casts any shadow on it. When it does, it’s a big deal called an eclipse. If you were really clever you could arrange it so that the orbits precess by 360 degrees per year and never cast a shadow on earth. (But then they would only see the target area about 12 hours a day.)
My point is that they probably haven’t thought this through...
...or that they have, and with an ulterior motive.