On the carpet :U
I'm confused as to why that really matters. I know static electricity can screw up parts but I don't exactly think it touching the carpet is really too dangerous, mine is on my carpet 24/7, and I've never had a problem with it ever so...
Actually it's the same case and everything.
Edit: Of course I'm not just dragging my computer about on the floor and usually am touching something that would conveniently discharge any static, like my desk which is made of metal.