When deciding where to mount tweeters, just keep in mind how the music is supposed to sound. It's supposed to sound like the band is out playing on the hood. Your goal should be getting the widest, deepest soundstage possible with pinpoint imaging. This should be done with the least amount of speakers possible. A pair of mids and a pair of tweets is all that is necessary for accurate music reproduction (one pair on the left and one pair on the right) IMHO. You can do a kick panel install using Q-Forms where you mount the mids and tweets in a pre-made kick panel enclosure, or you can put the mids in the factory location and then mount the tweets wherever you want. Personally, for your model, I'd suggest mounting them in the A-pillars firing either towards the windshield or towards the opposite listener (i.e. have the left tweet firing towards the passenger and have the right tweet firing towards the driver). This will help "time-align" the speakers without resorting to DSP. If you end up firing them toward the windshield, it will probably be a good idea to attenuate the tweets by 2 or 4 dB.
Mike