I do two rows of queen cells in mediums. I make my own frames with things evenly distributed. When I use hair curler cages, I use the ones from the Jenter kit over the JZBZ cups, or I use the ones from the Nicot over the Jenter cups. The Nicot ones are roomier. Usually, though, I don't use them, unless I'm using the incubator.
I bought some of these:http://www.brushymountainbeefarm.com/Cell-Bar-Frames-w_cups/productinfo/505/
and cut them down, and then build more of the same myself out of one bys. I split the difference for space and two rows works fine. The Jenter hair curler cages were loose and I used a strip of wood on the bottom with rubber bands to hold them up against the cells.