Seasoned POS owners will laugh at this, but we had to find the hard way, that the only structure everything else has to be anchored 5km away from is the control tower. All other POS structures can be anchored right next to each other. Put your corp hangar array and Ship maintenance array close, so you don’t have to fly here and there. In fact, we do suggest that you anchor all structures next to each other, thus saving a lot of time traveling inside the POS.