I've had one on a rock for almost 4 years, and several of the clones are on the same rock, I have hand only 4 or 5 that wandered elsewhere. So in my case many of them stay put.
When I did have some roaming I had them go over a large rock of brown star polyps, sat next to my xenias, parked for a couple of days right against a frogspawn and leather coral, and they never harmed any of those. Of course your results may vary.
No you really can't predict where they will finally end up, many of them do enjoy going high up on the rocks.
They really are one of the easier anemones, and will under the right conditions grow and multiply in your aquarium.
Thomas