Do weather controllers & orbital fabricators place resources on improved tiles?

[grades]

Or do the tiles where resources are placed have to be empty?

e.g. if I place a one of these orbitals above a set of 7 tiles each improved with a generator will no resources be placed over the orbital's lifetime?

 

[Promethian]

The tooltip of the sats answers your question without any room for misinterpretation.