I thought I’d try the Demaree method for swarm management this year, so I made up a couple of boards to help. They go above the supers, under the upper brood box, so the arrangement from bottom to top might be: floor, brood box, QX, super, super, demaree board, brood box, crown board, roof.
The opening visible in the second image does upwards, so bees, specifically drones, that emerge in the top box aren’t trapped inside.