From a Nissan
USA press release...
The coefficient of drag has been reduced by about 10 percent from the previous generation to a class-leading* 0.33 by optimizing the A-pillar section and outside mirror shapes, which also helps reduce wind noise. The turbulence behind the body has been reduced through optimization of the rear roof spoiler, rear side spoiler and rear combination lights. Underbody aerodynamic devices include a Nissan-first muffler spoiler, along with a rear bumper closing panel, fuel tank deflector, rear suspension cover, engine under cover and front tire deflectors.
Spoilers can exist anywhere on a car. In the case of the Rogue they are everywhere.