in general, speaker placement (and subwoofer placement, as appropriate) relative to room boundaries and the listening area is a key variable that each owner can play with ad infinitum... different positionings are one of the best offers in our pursuit -- cost free endless trials in the sanctuary of your own home :)
some speakers need room to breathe, others can use some boundary reinforcement for bass frequencies, some are best heard near field, others need some distance for driver integration... and so on
it just takes commitment, effort, fortitude, patience (and is some cases, a strong back and a willing accomplice!)... but getting it right is its own, substantial reward -- you finally get what you paid for when you shelled out the long green to buy all the gear !!!