I think the location in that video may be correct, but it is on the driver's side of the car if it is RHD based on when I had a new key programmed by ducklakeview.
Go under the footwell it's on the side behind /above the footwell speaker.
I know this becusse I was investigating a rattle (what else do we do with these cars? ) and my ews unit was loose as the plastic screw mount thing broke.