Tweeters are very directional in the way they project sound. So basically mount them so that they are pointing in the general direction of the person that you want listening to it. This should give you the best sound. If this information is not correct please correct me.
What's the difference between understeer and oversteer? Understeer is when the driver is scared. Oversteer is when the passenger is scared.
You should get coxial speakers if you are putting them in the rear, they are tweeters attached to the centre of the speakers that you can move around. There is not that much room in the rear to place tweeters that get good sound, so coxial is better off than component for rear, while component is better for front then coxial.
And yeah, you're right VNSVLE.
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