I doubt it will go in that anemone. I have a pair of percs and have been through this already, as well as started a thread entitled Nem for my Percs. Some others have commented that RBTA's do not usually work.
I had the same nem and my pecs would not go into it. The Ritteri and Gigantia are the natural hosts for this fish.
I got a Ritteri yesterday and the fish tried to get into it before I even got it settled onto the rock.
This nem is not super easy to find and very delicate. Not good shippers. The Gigantia is even harder.
From some of the replies that I got, it seems like an H. Crispa (Sebae) may also be a likely candidate to work.
Ken