1) I plan to have a large screen with a width of about 108" (120" diagonal), and place the W22's (only want on-wall or in-wall speakers, although I know most people will try to convince me otherwise) on each side of the wall, which would be about 10' apart from each other. We are looking to sit about 12-15' back from the wall. For HT purposes, are those speakers going to be too spread out from each other for this sitting format?
Isn't it better to have the speakers aimed straight at you?
These speakers stick out too much from the wall to place them behind a mounted screen, right?
2) And is the on-wall center channel directional or does it need to be? Do I need to have it placed on the wall at ear level? I think that would be at 4' or so.

Thanks!