With respect to their moving habits, it's really a crapshoot too. I thought my original BTA was anchored permanently once my clown pair were calling it home. Before that I had to re do my rockwork because it decided to hide at the back of the tank hidden from view. I let it be for a week or two until noticing that it was shrinking & losing colour. So I bit the bullet & rotated the rock with a lot of cursing & rearranging. After that it recovered & stayed put for years until the splitting episodes began. This caused some minor movement, but nothing too radical as the mother & clone(s) settled in. Following the last split, where the clone actually split again only a few days later, the mother shifted to another rock & the clones moved a bit also. Enough to start stinging & killing some of my sps as they recovered from splitting & grew.
I guess what I'm trying to say is that once you have one of these critters in your tank, ulitmately there are no guarantees that at some point for whatever reason, they will probably move. So be prepared to deal with the consequences, which may involve the loss or partial loss of coral. I'm ok with some coral loss, but I don't have anything super valuable, others stand to lose more. Either way, I enjoy having them & the Maroons in the tank. Can't imagine it without them.
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