Homemade quick change mounts

[z77280]

I have been looking for ways to have a quick change mounts without having to mill part of my bench away for the Inline Fab unit. I am wanting to keep my benchtop clean and don't want one of the large "stick up" units line the other Inline Fabs. Anyone have pics of a homemade unit that fits this bill? Think I have an idea for an undermount, but want to see what you have done.