I have four 30 frame horizontal hives using deep frames with a queen excluder in the center and a queen in each end, an entrance at each end. These hives are mainly for brood production but I have on occasion placed supers on one just to experiment. You have to place a center divided queen excluder in the center of the hive and super up in the middle of the hive when you use this configuration. I did loose one of the queens in one of the hives at one time while I had a super on and it still worked well with the center location of the supers and two entrances. In my Alzheimer clouded mine there is no better configuration for raising brood for making splits than to run a 30 frame horizontal hive with the center excluder and two good strong queens. During a good strong nectar flow I have had to add a new super about every two weeks. The most honey I have ever had in a year was seven medium supers of honey from one hive.
I'm glad to hear that has worked for you! This is a configuration I was considering trying on an older hive next year.