If you purchased the basic kit, it does not come with the base (the stone plate you refer to).
If you purchased the Pro Kit, it does come with a base.
Either way, you can order a base from Wicked Edge directly. Or mount the sharpener to some other material that you want to use. The bases straight from Wicked Edge do come pre-drilled so you just bolt it on in that case.
I have a Pro Kit on the way (I hope I get my shipping email soon).
