Take advantage of the shipping brackets.
It might even be a good idea to check with your friends before you order and see if they want to sneak another gripper into a box where there is room.
One reminder is that getting three Ironmind or Manus grippers in the box for the first bracket asks a lot of the gripper packaging. The grippers are well-protected, but the packaging might be a little mashed. But that's what you'll do with the grippers anyway! MASH them!