Sounds fine to me as the two fish are both quite different, even though both are cichlids. The angels will be very likely to like to find a place to "hover or move around somewhat off the bottom much of the time and the rams are likely to prefer lower and if there is some type of cover, like rocks, wood or heavy plant leaves, they are very prone to setting up shop in/under something.
I don't find either type to actually prefer conflict, so setting a few items up to allow each to have their preferred spots will help. Young of either are less likely to be trouble of any sort but then there are always mavorics in most species!
No guarantees, of course, but a quick cover by putting something like a flower pot in will make the rams feel better---if it does turn out they need it.