@markcasazza - because of different speaker designs and different room conditions, there are general guidelines on how to place speakers, then dial it in to one’s specific speakers and room. There is no one size fits all. It’s common to move speakers and maybe listening positions to dial in speakers including experimenting with toeing and distance from back wall for bass energy.
Also, make sure you have adequate room treatment especially for first reflections to avoid muddling up the Sonics.

