I’m setting up a Sonos system, primarily for movies, music secondary. I am particularly trying to “tune” for Dolby Atmos. The system will be Arc, x2 Era 300’s, Sub Gen 3.

The question is regarding the Era 300’s. They will be 5 feet (150 cm) behind the back of the couch on the top of some bookshelves, about 6 feet (180 cm) high. Space to each side and behind isn’t an issue. Distance to ceiling is, well, borderline, depending exactly how measured.

I’ve read the Era 300’s should be mounted upside down if within 2 feet (610 cm) of the ceiling. However, the Trueplay tuning, which I love, hasn’t yet been implemented for the Era 300’s while upside down (according to what I’ve read here).

My distance … exactly 2 feet (610 cm) from the top of the shelves to the ceiling. However, if I measure from the top of the speakers, which I suspect is correct, then I have about 15” (450 cm).

So, given the above, including I’d like to use Trueplay if I can, should I still mount the Era 300’s inverted?

I’ll try both ways when speakers arrive (out of stock locally but due in this week) but was wondering what people might suggest.

P.S. Would prefer them at head height on stands but that’s not really an option.