Take a look at PandaHome. I tried all the others and in the end, this one was the best mix of ability and stability. It still has a few quirks, but it literally is getting better by the day in stability as well as a fairly constant upgrade in functionality. I highly recommend it. It will support up to 11 screens, but even better, it supports folders and it also has horizontal sliding drawers that can hold up to 6 apps each (up to 6 of those) and they show up on every screen.