It just looks like several curved boards stuck together to make a circle, so I don't think it would be difficult to set up at all. They could be daisy-chained using MIDI through ports so that all of them output to the one synth and so all have the same sound, or a synth that can output multiple sounds so each board has a different sound (if those exist?), or just a synth for each of them. Derek Sherinian had at least three boards set up live when he was in the band didn't he? Logistically it's pretty simple.