G18/R3B and Robot Orientation

Is the 15in measured in-plane of the frame perimeter, as it’s defined while sitting flat on the ground, or is it measured horizontal relative to the floor, regardless of robot orientation?

For example, if my robot changes orientation while it’s hanging from the tower such that it’s “nose up” and the hanging device now protrudes more than 15in from the front of the robot (but in an upward direction), is that a violation?

Robot sitting on the floor.

When other than on level ground, it is the plane of the robot as if it was on level ground