All speakers should be less than 39” from the front wall or more than 7’ off the front wall based on the speed of sound. Panels and speakers with cardioid bass are the exception. This has always worked for me with every speaker. I have a big room where anything’s goes. 7.5’ is always best but makes my video setup hard. 39” sounds fine too so I use that. 8’ ceilings are the real problem anyway….
where it gets complicated is side walls and ceilings matter too.