RRS has altered their web site making it harder to look through a list of all plates. I have some of their general purpose plates like B6 and B9 which work well with a range of cameras that aren't too huge. The flange is placed along the front or back edge of the body and the screw tightened. The flange stops the plate rotating. A little rotation is why plates can unscrew spontaneously.
I looked at Kirk's site and I notice that they have some general purpose plates with cork or other pad to prevent damage to the base. In my experience, the pad allows movement, both of the camera on the tripod and eventual loosening. The plates I saw there did not have the ridge to prevent rotation, so I would not recommend them.