Zee's circle part (where all the cables connect) fits on top of the wheel arch, then a set of cables goes off from here to the various points, and another set grounds on to the "-" battery terminal.
My one you take apart the terminal connector and bolt it straight onto the battery, and one lot of cables goes off from there. (see pic) I also had to chop about 6mm of the part the circle sits on, as it kept touching the bonnet.
pic
My one (£8!)
zees