The saddle covers on Kris Holm have vecro that is lined up between the mounting screws. In the past I have connected the velcro around the seat post after the base was mounted to the seat post but I question if the velcro is meant to be placed under the seat post?
I wonder this myself!
It goes under the seatpost.
Definitely under the seat post (so the velcro gets squashed). I asked this same question a few months ago, and got the same answer.