The tonepad power supply don't have isolated outputs, so is it safe to add extra outputs on top of the 5 on the PCB?
It sure will work fine, it's just like daisy chaining it I would think.
Here's one I made in the same veins just putting 9 sockets in parrallel, same as daisy chaining it.
(http://i.imgur.com/KnTfkEn.jpg)