To help you decide how far to put the speakers from your wall use one of the three options given in this guide.
Mounting speakers in corner of wall.
Wali dual side clamping bookshelf speaker wall mounting bracket for large surrounding sound speakers hold up to 55 lbs.
When mounting the speaker bracket to drywall or paneling use toggler tb hollow wall anchors also included in the panavise hardware kit.
These anchors require 5 16 inch holes.
Ideal speaker placement for the front left and right speakers is 6 to 10 feet apart and positioned at seated ear level.
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I intend to mount the speakers on this 32 foot wall but could mount one on the mechanical room wall so that one would be on the base and one on the leg of the l shape created by the connecting walls.
Ideally you will either flush mount them to eliminate boundary interference from the front wall.
Odds are that the left and right will straddle a flat panel or screen and the center will go in just below or sometimes above.
This is the only way to completely remove quarter wavelength cancellation caused by the wall behind your speakers.