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The first paper just looks like a grab-bag of everything they could find research on - ie a non analytical literature search.
The second paper, though, is quite fascinating - active spoilers located on the front bumper side and A pillar. But neither was good for drag, and their argument that the spoilers could help control the car in cross-winds overlooks the fact that the spoilers would have to be able to move extremely fast. (In the paper they get over that problem by talking about a constant crosswind - but that's not very real world.)
Re the boundary layer and:
Is this thicker boundary layer air responsible for mitigating or jumping over the different angle between rear window glass and trunk on a saloon/sedan?
No, in fact the thicker the boundary layer, the less likely air is to follow changes in shape. That's why vortex generators, that put moving flow energy back into the boundary layer, can cause better flow attachment around corners.
Re:
Where are the greatest pressure differences measured at the rear of the car?
There is almost no tech lit available on this, and I haven't done that series of measurements. My guess is that the answer would be heavily dependent on the shape and underside smoothness of the car.
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