I got two Pi boards myself, they are a lot of fun to mess around with. I have to ask the question though... why would one not use a 1 foot usb extension cords on each port of the hub to keep the Erupters farther apart? Hell could take a block Erupter shell off and vaccum seal all the PCBs and the exposed usb parts and just lay them in a few buckets of water, might melt the plastic but who knows! Iunno fun stuff