Ours came with the one shown in the pic and used in conjunction with the small dish kit below. Fits perfectly in that left corner. The mat rolls up and covers the whole sink. It's also used as extra surface and could be used as a cutting surface if careful but that link shown looks like it may already be pitting.
Fits perfectly under the sink or the drying rack and base fit in the unused convection oven. Ignore the six people claim...doesn't hold it all for three and why we use both.
We also have two different sized cutting boards with one really used more as a cover for the stove glass and serving tray.