I’ve spent some time optimising speaker placement. Fortunately, my listening room is largely for my sole use. Nonetheless, I’ve had to make some compromises to pass muster.
The room is roughly 4m square with a bay window behind the listening position. Speakers are a metre from corners and 500mm from the wall (albeit that space includes bookcase.) I’ve paid close attention symmetry with the speaker initially beaming directly toward the listening position; but they now have an approximate 10 degree toe-out from this position. I also took time deciding on the optimal height before buying stands (a relatively low 500mm.)
I also tweaked by playing a mono track (Wouldn’t It Be Nice) and inverting the phase of one speaker, adjusting until the voice was all around me rather than centre. Then I changed phase back and use stereo tracks to adjust bass (Roundabout) and sound soundstage (Moondance) and so on.
Definitely worth the effort!