I see what you mean....you must fit a new panel for the rack - to reach down to a solid frame point....then you fit a big rubber plug to seal it all back up!
Seems awkward.
A template is used for drilling the panel to reveal solid mounting points just below, then, if needed - some don't - black alum. spacers are used between the rack and the scooter's frame. Whole thing is done with holes @ size of 2 dimes. i.e. the scooter is manufactured and prepped from stock for this accessory.
Kymco could have placed mounts for the screws just beneath the plastic panel?
Stig