Is it normal for Porsche Paramera's two rear wheels to camber into a figure of eight?

This is normal, in fact, many cars are like this. This is actually called a universal wheel. . . Improve the safety of wheels.

Caster angle, the angle between the kingpin or kingpin (the steering shaft around which the wheel rotates during steering) and the vertical line on the ground when viewed from the side of the car body. Basically, a negative back angle represents better flexibility, and a positive back angle will have a more stable straightness.