I tried them in all configurations and so far the best for me is vertically, speaker A on the Left, ports facing in.
Also after working on them for a while I am very happy with how they've been translating. Clients are excited by the sound and they are not tiresome to work on in the least. I find myself rarely switching to my P11's.
What sort of placement did you go with for your A77X's? Same as the S4X's?