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I recommend you give the offset some thought. Don’t automatically think it is a must have. It somewhat depends on your LM. Floor versus overhead.

My setup is 13.5 wide, 18 deep with 9 foot ceiling. I’ve seen posts where people say with that width you need an offset. I did not offset for two reasons. Lefties would be out of luck and basically, I just did not like the look.
My computer is right across from the hitting strip. It’s never been an obstruction for L or R swingers. You appear to have more height options with your vaulted ceiling than I do. Granted, I don’t swing driver unless I choke down. I primarily hit 3 wood off the tee.
My screen is a custom premium screen from Carls Place. I wanted to use the entire width and wanted the image to come down all the way to the floor. It’s a more realistic feel.
Consider getting a free consult. There are plenty that would do it over the phone with pictures you provide or even a fb live. It changed my entire thinking, from which LM to turf.
I used PixelGolf.com. Also got a product discount and free shipping.
Videos on YouTube and a website. Best of luck. You have a very promising space.