No u won't need them as long as they came with the switch pod (bass blocker and mid filter switch) which most component systems do come with. in the top corners of ur windshield, people outside can't see them because of the strip of stock tint there, only can be seen from the inside real good sound Q. Don't stick tweeters on the dash, ever, ull deflect off the windshield and high frequencies don't tend to like that. you do have a good many of choices, just try different spots out, i'm sure ull find the one ya like.