I used to separate the queens and the drone colonies, but now I've gone to Ray's way - drones right in the same yard, but I try to choose a location with an obvious physical structure or features for the drones to establish a DCA.
The drones need to be housed nearer to the DCA than the queens, because they have to go home to refuel more often than the virgin queens do, so the DRONES go in the center, the queens can be in the same yard or up to a half mile away, though after once viewing a DCA in action for over two hours with maybe 2,000 drone comets occurring, CLOSER TOGETHER IS BETTER.
Your main concerns, far more important than location and / or arrangement, is that the drone mother colonies are FED A CONSTANT SUPPLY OF PLENTY OF POLLEN, and your queen cell raiser colonies have 10 frames of capped brood imported from other hives 10 days before grafting and are well fed with pollen, pollen substitute, 1:1 liquid feed and plenty of natural flowers in bloom. The queen cell raiser colony must have "too many" bees inside - very populous and boiling over with bees if opened.
If the cell raiser colony is not strong like 2 brood boxes tall and furious with activity, newspaper-combine 2 hives into a single colony two or three weeks before grafting. In doing so, MAKE CERTAIN THERE ARE NO EXISTING QUEEN CELLS in either hive, or you'll likely lose many bees to a swarm before grafting day. Do so again at -10 days when you make that 3rd box of imported capped brood - NOT ONE QUEEN CELL ALLOWED!
These, along with good grafting or other queen cell production method, or natural queen cells will ensure a good chance of well - fed, well - developed queens, and, hopefully well-mated queens.