nat

Thanks @willland. Is it better like this? As 240sa has 2 faces speakers, is there any problem with the sound bounced from the rear wall? And what heights would be best for Surround and Elevation speakers?

My room layout and speakers are as in the pic. I did try to draw the size of all objects in the room relatively correct. I have some questions: Is the location of the surround speakers correct? What are the heights of the surround speakers and elevation speakers in front? Any other advice for the layout?