[Advise need on my audio room layout]

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?

[Advise need on my audio room layout]

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?