Need help on rear surround placement

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I am installing 2 Speakercraft Starlet 4's in the front with Speakercraft
AIM LCR1's as Center and rear surrounds. My couch will be on the back wall
with the surrounds above it about 9ft apart and aimed toward the couch. I
have a link to the floor plan to explain better. My question is should the
rears be farther apart? Should they be against the back wall or should I
move them forward some to avoid weird acoustics (reflections, etc)? Do they
need to be square with the front? Ceiling is 9ft high.

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