One option is to mount monopoles in the top corners aimed straight down at the floor corners. This effective "paints" the entire corner intersection of the two walls with sound making it diffuse yet with sense of it coming from above, which Dolby endorses and of course is true in an actual movie theater.
In A/V reproduction accuracy, there IS no concept of "accounting for personal taste/preference". As art consumers we don't "pick" the level of bass, nor the tint/brightness of a scene's sky, any more than we pick the ending of a novel or Mona Lisa's type of smile. "High fidelity" means "high truthfulness", faithful to the original artist's intent: an unmodified, neutral, accurate copy of the original master, ideally being exact and with no discernable alterations, aka "transparency".