Well, you could put it on the surface and it would grow, but I wouldn't know about how that would look. The leaves would start to face the light and be crooked and whenever the water spun it around it would start redirecting itself towards the light again. It'd probably end up looking pretty odd, but your could do it. There are other surface plant alternatives if you want to try those.
I just want something floating at the top of a little 3 gal nano that I've put up. Maybe I will plant it--it's tall enough that a great deal of it would be at the surface anyway. I've had it floating free for a few days and I didn't think it looked too bad.