i put mine on top. think about your cutouts. the build down for brood and back fill above and around for honey. if you are putting honey supers on for honey, you want to put them on top. if you need more room for brood, then you want another brood box. if you end up with to many brood boxes going into winter, you can reduce as you head into fall and brood production drops. you guys are warm most of the year, so you may need more room most of the year.
that's my logic....and i'm sticking to it
besides, the queen will use your honey supers if she wants to, unless you use an excluder......you are giving them the potential for more space if they want it.