[daltore]

"Above the plane of the platform" means that every molecule of your robot is above the infinitely thin plane that is parallel to the top of the platform. Since the top of the platform isn't perfectly smooth, that would be impossible, but the general idea as measurable by the human eye is that as long as you don't have anything drilled through or hanging off of the side of the platform, you are above that plane. I guess this means if you have any loose cables or wires, they'd better not hang down too far.