Here's a sugestion for you, look on the back of that power strip you've got next to the cabinet, they commonly have sloted hole thingies on the back (cannot think what they are correctly called)
what you can do is put some screws into the one of the sides of the cabinet on the inside, don't screw them all the way in but leave the heads sticking out.
You can then hang the power strip on the screws and tidy that away inside as well
Oh an a quick question, I see you've got 6 fans at the back sucking air out, but where is the air getting sucked in from? ie where is your vent?