That's so cute. Most of mine shimmy themselves inside of their silk plants. Only a couple of mine actually lay on top of it. So if your betta prefers to lay on the plant, than I'd get it. It doesn't look like it would hurt their fins, but you can always run it over toilet paper or pantyhose.
I should make one of those. All I would need is some suction cups, clear plastic string (or some aquarium safe glue), and a nice leaf from a craft store. Guess what I'm doing this weekend! XD I could make this while I am making some dividers for my tank.
My poor betta has a deformity so he can't swim so well. He can float though. I am sure he would love this since he loved hiding in a plastic flower I had in his tank.