Dolby .4 setup says, seat at 90 degrees, top front at 45 degrees, top back at 135 degrees.
I calculated that formula from (Home Theater Guru - episode 3) YouTube video and the measurement came out exactly where the stereo shop told me to put it. Which is above my L/R speakers. But I feel as though, like Anthony Grimani says, “too close get confused”.
Your drawing makes sense. You mentioned top front would be not recommended, would moving it closer to sitting position. It would be 6’ apart from overhead speaker and 2’ away from LCR.