multiple angels in a 180

[cowfish]

I've just about finished setting up my 180 FOWLR and will be transferring over the fish from my 75. I currently have an Imperator (Pomacanthus imperator)), but would also like to purchase either an Asfur (Pomacanthus asfur) or a Blueface (Euxiphipops xanthometopon). Would either be compatible with the Imperator? I'd either introduce the 2 simultaneously or Blue/Asfur and then the Imp. Let me know what you think