If the Companion Drones are on top of a building or ore, the mouse selects the building/ore. If, when you start the game, you place a drone on top of an ore, you won't be able to open it, making it impossible to place the equipment in the grid
if, when starting the new world, I placedthem on ores, the drones would become unusable forever, as it is not possible to fill them with fuel since you can't select them (if I don't have fuel in the inventory when being placed)