There are lots of great links in the "Stickies" section at the beginning of the forum that have LOTS more info on anemone propagation and many other great reads.
Beyond that, what is being referred to is "indoor/outdoor" carpeting. Some people use astroturf type material and some people use more of a carpet-like material. The anemones can attach, but are easy to remove without damage. Also, they are easy to remove and clean. You should wash them well to remove any residue on them. I've seen people run them twice through the washer without soap to remove any soap.
HTH!
Josh