The hammer may like being a little higher up (assuming those are biocube LEDs). I would keep the xenia in the sand and watch for it when it begins to spread off the home colony. Also the palys on the top may be better off on a little island since they grow so fast.
I’d separate the palys and Xenia (they tend to be kind of invasive) so that fragging/ thinning out the colony is easier. I recommend keeping the Xenia off your main rock work as they have a tendency to frag themselves and take over a tank like a beautiful weed. Hammer needs a lot of flow (not like a tornado but enough to make the tentacles sway). What kind of look are you going for? The zoas would look nice dominating (and they will do so) but if that’s not what you want then make sure you put them in a place where you can easily frag them off aka a smaller rock you can take out of the tank completely from time to time without risking a rock fall