Great! Since we have the same stacking style. May I see your scape for inspiration?I honestly think they would all be fine. Just leave plenty of room to reach every part of the glass for cleaning, and make sure you can easily pick up larger pieces to move without toppling the whole thing in case you need to retrieve something from the tank.
I am a “stack it and forget it” kinda guy. My aquascape took me 5 minutes for 175# of rock or so.
I like it. That's cool how it steps down from left to right in good proportions. Then the small rock in front of the tall one is a nice touch.UPDATE: I was thinking about breaking apart the rock, but once the light was up I thought it looked decent, so I might keep them as is :\