Not really at all. They can sit in one place for days or years but once they split, or decide they want a change of scenery they can take any corals out along their path. I've had a couple lose their footing and go into a powerhead also, sending anemone goo everywhere!
Saying this, many mixed coral tanks have anemones in them and they don't cause too much hassle.
I got rid of mine a couple of years ago and don't miss them.
If you want something that moves in the current then maybe consider a hammer or a torch, same wavy motion just on an immovable base.
Hope that helps,
Dunc
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