You must have missed the memo
Maybe you are being facetious(?) At the 2:23 point in the video you posted it specifically states to *not* transport flat on the floor. Orienting it carefully in a flat position clearly isn't a huge issue provided it's protected adequately.
It's fairly simple logic, if you think about it for a new york minute . Laying the display flat means the entire surface area has to be protected from coming into contact with something protruding upwards. You minimize this by securing it/transporting it vertically.