Yes, so ceiling or high wall mounted speakers in the common positions (in order of what seams to be the most effective):
Top Front, Top Back, Front Height, Rear Height, Top Middle
Unless you have a processor capable of so doing, you usually can do any of them as x.x.2 with possible exception of Top Middle. I have seen issues from time to time with people trying to mix in an x.x.4 setup Fr Ht and Top Bk or similar. My limited experience is that they seem to want you to do either Tops or Heights, and only when you get to an x.x.6 capable processor can you add in one of the others.
If I am incorrect, I'm certain someone will rectify and I welcome the correction.