A. palmata is highly protected species that is not found in the hobby, it is generally only kept by reef restoration projects for research, like Dr. Vaughns successful experiment with micro fragmentation in A. palmata, A. cervicornis and A. prolifera. I have seen Acropora cervicornis at MOTE in Sarasota, I have seen all but A. prolifera while diving in C. America and the Caribbean..
I'd imagine considering A. palmata's density and it commonly found on the Crest of the reef its water flow demands would be substantial, like a surge device would be most ideal.
Good luck obtaining some, if you do, you would be in violation of federal law.