Mirage Nanosat5.0 install

My home theater is being installed on an outside wall. Therefore this makes wall fishes very difficult. In order to prevent having to run wiremold all over, I decided to install the nanosats upside down to the ceiling and run the wires in the attic.

Generally speaking how far apart should the front speakers be placed around my 55" lcd? L and R 7' apart? Any suggestions? I'm hooking up these speakers to my AVR-1612 via 14 gauge wire. I'm using a decade old Sony SA-WM40 12" subwoofer.which I placed in the front left corner.

Thanks for your help.

I thought maybe an image of the setup I'd like would help with feedback. So here is my amateur drawing.

From what I've read it is best to space L and R front speakers 7' apart? Or since these are omnipolar should I just mount them in the corners of my red box makeshift home theater area? I plan to mount these nanosats upside down to the ceiling using the 1/4-20 threaded screw on their underside. I will have a washer on both sides of the drywall to distribute their small 2.9lb weight.

I'm open to any comments concerning this setup before I make the holes and give it a shot.