If you haven’t been training long or need to build muscle because your bodyweight is light or you’re just weak, I’d just stick with what 531 tells you to do.
If you have been training for a while, I’d only do variations like board presses for assistance. If you’re gonna do light squat, do them paused at the bottom and pause the light deads just below the knee. I would not recommend shoulders on a lower day.
Lower days do your main lift and then something for hamstrings/low back then mid back and then upper back. Upper days do the delts, triceps, biceps. This is better for recovery.