How are these guys doing the top hole drills through the wall? In that demo, they have direct access to the top board. Is this for new construction or something? Are they removing drywall from the upper floor?
If you don't have access to either there is a drill bit on a 40-80 inch flexible shaft. You cut a hole in the wall for the box you'll mount the ethernet in and then use it as access to drill up/down/sideways behind the wall.
