I looked at that location. I was hoping to mount it in a spot that if I wanted to add more accessories that I would not have to remove it in order to make the connection. By pressing one side of the box all the way up to the seat mount it would make that difficult!
XSV sounds like you got it figgered out but here is the post I did on putting the fuze block in the tool holder.
http://www.zggtr.org/index.php?topic=15897.0
I put mine in the tool box's place, took the tool box out.