[RP-500SA]

Thank you very much for this extensive explanation, based on your experience.
So you are sitting from ATMOS speakers (184cm) 6ft.
For me, this distance is 300cm (10ft)

I was going to tilt the loudspeaker backwards so that the reverb sound would reach, so I thought it would be better.

However, to follow your indication, I can achieve my effect by setting a greater distance to the ceiling, because I am sitting from loudspeakers (180cm) 10ft.

Question on what value was the distance to the ceiling set?
I understand that the speakers have been in the same place all the time?
Has Audyssey calibration been done after each change?

[RP-500SA]

Thank you for your interest in my problem.
The problem is that I can not tell if I locate sounds well.
I would definitely prefer to do it in a way of calculating.
Is there a known angle of reflection from the ceiling of the sound?
I would like to conduct such an examination at my place.
People have suggested that it is 90 degrees, but I can not find such information.
My overhead speakers are 5.08 ft to the ceiling, in a straight line the listening position is 9.8 ft away and I want to be sure that the reflection is correct.
Should I not change the angle by positioning the RP500SA loudspeaker alone, substituting the distance under the front or rear legs?

[RP-500SA]

I have loudspeakers from the subject and all the time I'm tormented by the question whether I have them properly configured, whether the signal reflected from the ceiling goes into the listening position.
How can I check it?
There is no software for these purposes?

This setup does not tell me anything: https://www.dolby.com/us/en/guide/dolby-atmos-speaker-setup/5-1-2-setups.html