I used a pair of one π's in the back of a Porsche 928 for a few years. The rear window of those is sloped, and so I set the speakers back in the hatchback, face up. Put some velcro on the back, a 2" x 2" square on each of the four corners, and this kept the speakers in place even under hard corners, braking and acceleration.The speakers really, really sound good like that. Normally, one π's need a subwoofer, but with the car's cabin gain, it doesn't need a sub at all. And they're so efficient that 25 watts is seriously loud. I highly recommend this setup for you.