|I have 2 long bolts that go through the boot, through the plate, and through the base of my rear skateboard trucks. I drilled 2 holes through the truck base in the middle so that they 'centrally' bolted to the heel of the skate boot.
There are also 4 small bolts attaching the truck to the plate through the normal truck mounting holes.
You can special order bolts for mounting plates that will not pull through the sole of your boots. They look like this :