Thought I'd add to this thread for the next person who might try to remove the trim.
Just completed a dashcam with rear camera install on a 2014 Superb.
btw thanks for the exploded diagram davidj241 (from 2012).
When removing the bottom trim my biggest tip would be to ensure to start prising away from the joint section (where the plastic rivet is) between bottom and top trims.
The trim pulls away easiest if you imagine hinging from the boot-lock end, something which I learnt too late.
If you prise away from the lock end first (like I stupidly did) toward the wiper then the locating pins in the centre will deform and jar the trim against the upper trim - which is what happened to me.
You can free up the clips around the bottom of the tail gate (6 clips), as well as the 2 clips along both edges, but leave the middle ones (under the rear screen) until you have prised apart the plastic riveted section.
The best way to visualise is that the trim fits back on easiest by locating the boot-lock end clips first and then hinging from there.
Have a close look at the exploded diagram and notice the direction the clip holders near the wipers go.
Good luck.
John