It's a bit of a misconception that floaters can't handle movement. They just can't handle aggressive water movement. As long as you corral them with some airline tubing or fishing line, they typically can adjust quite well. They won't do well if constantly disturbed without anything to hang on to, though.
I keep delicate floaters like Frogbit in my 12gal long tank (see signature) and it does quite well. Mother plants are placed behind the spray bar and they send out baby plants that remain attached. Those younger plants grow really well in the current created by the spray bar and as long as they stay attached/anchored to the mother plant, they're fine.
P.S. Here's a photo:
Last edited by somewhatshocked; 01-18-2013 at 02:56 PM.
Reason: added photo