I’m no doubt the source of the asset confusion – sorry for that! Still you’ve done a good job blocking out a few rocks. Earned full points from me 👍
I think 3 rocks should be plenty to populate the scene. The benefit of rocks is they can be rotated in any orientation and still work. So I’d recommend sculpting them to look good from all angles. It can be sensible to sculpt the bottom of the rock flat but in this case I wouldn’t do that to maximize their usage.