It is matted, but just to itself. It's made up of a bunch of little tubes that are all connected to each other... alot like honeycomb. It's not attached to any rock at all.
Yeah... I've thought about glueing it to a rock as an anchor, but the bottom of the coral is so convoluted because it's just a matrix of tubes, there's not much area to glue to. I'd have to form a little epoxy cradle or something and then gently glue it to that. I was just hoping someone had one of those "why didn't I think of that!" type ideas.
Anyway... I think the question might not even matter in a few weeks. For whatever reason, LiveAquaria felt that this shipment didn't deserve a heat pack (grrrrrrrr...) and the little guy just doesn't seem like it's going to make it. It took a couple days to even open up fully, and then has been declining steadily each day. I'd say less than a 1/4 of the polyps were even open yesterday. LiveAquaria doesn't know if they screwed up, or if their shipping people decided our weather didn't warrant a heat pack. (Hmmm... our high temps that day were in the low-mid 50s. Go figure.) They extended my warranty by another week, but I'm pretty sure the thing will still hang on past then. But it just doesn't seem like it's going to make it.