For better sound (this is an opinion) mount them flush in the doors around knee height (somewhere around the side or under the armrest, window switch, door pull close protrusion on the door. The tweet is close to the woofer this way, and doesn't overdo the highs. Plus it ca still be aimed for good imaging. A kickpanel, which 'arguably' is the best sound configuration has the tweeter and woofer mounted very close to eachother.
I was thinking about flush mounting the tweeters into the doors but I didn't want to do anything that involved cutting... if worst comes to worst, I'll resort to flush mounting the tweeters into the doors. May sound like a silly question but how much will it cost to get it professionally done? I'm guessing it all depends on the installer.
Thanks for the 411 guys... I think I'll get the tweeter flush mounted into the doors... hopefully it won't set me back too much. Probably won't do it anytime soon so it'll gice me some time to save up for the components and install.