[rolyasm]

Tommy,
You are in the pre-sheetrock stage, correct? What I would do, what I did, is run a -load of speaker wire to different locations. Run a pair to the direct back center, another pair more toward the edges, and another one half way between those points, emulating the pictures listed above. If you want, you can connect them to a speaker terminal box so you have easy access to them, or leave them hidden until you decide. Take a picture, like you have, but of all your wiring. You never know when you might need it. I also ran extra speaker wire to my fronts, center and surrounds, just in case one wire was ever cut or damaged. It doesn't hurt to have the extra wire and it leaves you the options you want later. Someday I may want to bi-wire, presto, there is the wire. Lets say I want to try some direct radiators it my back, bingo, wire is there. You get the picture. Then you can experiment to your hearts content.
Roly