Where are the front speakers? Where do you sit while watching the projector and TV?

You have two different use cases (projector and TV) that are impossible to combine in one set up. The placement in your drawing seems geared towards TV viewing, but, unless the TV can be turned towards your preferred seating position this will not work very well:

• the soundbar needs to be directed to you, which it isn’t at the moment;
• the right surround should not be pointing at you - preferably it should be behind you.

If the TV cannot be turned I’d sit on the other couch and place the surrounds on the counter to the left an the right.

Since the projector (if I interpret your drawing it is actually the screen, not the projector) is on a different wall again, it warrants its own system. Or move the screen to be in front of your TV x be sure not to cover the soundbar.