From Voodoo Lab:
Power up to 4 pedals on your pedalboard easily with the Voodoo Lab Pedal Power X4. The sturdy aluminum housing attaches to even the smallest pedalboard with no hassle. With 4 isolated 9v outputs, you can distribute 100mAs of current however you like. The multi-pole filtering feature also prevents unwanted AC noise. The is the perfect companion to any small pedalboard.
This power supply is designed to mount perfectly beneath flat Pedaltrain boards like the Nano without ANY modification to the board!