It's not a good idea to direct release a package queen if the queen and package bees haven't been together for 3 days or more. If they have been, direct release is doable. Your other option when hanging the queen cage is to have a couple of extra deep foundation starter strips to place the cage between, but you will need to make sure that the strips are absolutely secure and have no way of coming loose. The bottom edge of the strips should hang down lower than the cage as the bees will start comb building along this edge. Clamping the foundation between split bars works good. The very last thing I want my bees doing is starting off with poorly aligned combs. The other option is to hang the cage well below the top bars so there is less interference from it when they start combs on the guides.Some people say to put the queen cage on a brood bar but others say that will result in crooked comb.