So the tab should be at the bottom hole (the 4th picture) and not the top hole (the 3rd picture) correct?

Could you provide any more details on how the tab is situated? I can't feel the tab or anything that has any 'give' to it using the screwdriver. Which direction should the tab need to be pryed in order to release? Away from the windshield?

In the bottom hole, it feels like there is something in the center keeping the screwdriver from going in, but if I tilt the screwdriver to either side I can slide it all the way up inside the piece.