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Yes you can, there's a cable for that. I don't know what it's called but I've used it on my own board. There are effects though (like my new delay) for which the 240mA of a doubled output aren't enough. So check your power consumption first. (And hope that it's correctly specified...)
@Apone I actually used that board. It's solid. The bag works well and there's a space underneath for a power supply (but iirc the Harley Benton one is just too big to fit). Also the cable routing can get a bit messy on this. If that is a concern to you.
This one: http://www.thomann.de/gb/palmer_mi_pedalbay_40.htm is of similar size and has a space for a power supply underneath which fits the powerplant (I own the one one size larger and it does fit) Also the "open" construction allows for neat cable routing. All zip-tied up here.
edit: Newpage fail. Just saw you already bought the gator. Don't worry it's solid. could be a little bit of a faff fitting the power supply underneath though.
Word of warning:
The small HB powerplant has 5 isolated outputs.
The big powerplant does not. All the outputs (except the 12V ones) share one ground, humming happily.
I have both at home and have confirmed this through opening the thing up and checking. ;)
edit: For what it is, the small powerplant is really a bargain. It works fine on my setup. Although the low current may be too weak for certain effects (looking at you delay) or wireless units.