When you say they just rest on the rack mount, nothing just rests on anything. The rear mount slots into the back by loosening up the bolts that extend out into the rack from under the fender. The back seat is solidly mounted on all 4 points.
As for the shock location, I believe the brackets may be turned around. I don't recall needing to lift off the back seat to mess with the shocks. I **think** the seat bracket goes behind the shock but it has been a while so I could be wrong.
John Henry