hi mat that is not quite what you need. although you may want one as no shop should be without one. that is known as a work mate I have used mine to yes set things on. also clamp a beltsander in upside down so I could use it stationary. I have clamped log slices in it to make clock faces. you are needing a workbench type thing either fixed or folding. work bench plans are as numerous as leaves on a tree, its just what you want to do with it.
you just set them up to suit your needs if you want a square fixed on it buy one and screw it down on say a corner out of the way of the main working surface. hope all that helps Jim [Non-text portions of this message have been removed]