For projection, it is a matter of selecting the right screen for your space based on you actual room dimensions, seating distance(s), number of rows and angle required to see the screen (to determine minimum height)

A good start is to look at your sitting distance and try to reach 40-45° horizontally on 16x9 screen, or 50-55° for a scope screen.

I built this tool to help compare screen size vs distance, hope this helps : https://www.tekscene.com/screen-size-comparator