I put one of them on my bike, behind the dash area to allow for all my accessories that I use. I used I believe a #4 coated power cable with a good screw on brass connector from Autozone and used it to apply power to the stud on the fuse box. The rest is just using some good connectors to apply power from the fuses to the accessories.
I ziptied one to the center battery strap on my bike. It will fit under the side cover nicely. I also use the nut above the battery for the battery strap atachment as a grounding block. The stud that the nut attaches to is long enough to accomodate several negative wires using rings.