Guess i'll just have to wait for people who haven't mounted their tweeters in the stock location to agree with me
I didn't say the windshield vents..
There is a spot beside them with nothing cut out, if you have the capacity to cut a hole that could pass as a fairly even circle, and distance them equally apart, then you'd be able to flush mount them there.
The fact that the windshield isn't flat is also a good thing because it will have a wider field of reflection. If the tweeter isn't suppoised to be more then 6 inches away from the driver then why does Jeep, Chrysler, Dodge, Mercedes, and even Pontiac all mount them either in the dash or A-pillar/window location?
I suggest before you do the stock mount, wait for other people who have their tweeters mounted either in the dash or A-pillar location, or just the not stock location so you can have their opinions too. IMO the A-pillar location is great for wicked stereo imagining plus if they are in the stock location, you will have a very unbalanced sound stage because you will have highs comming from 5 feet away, and highs from the other side the are a mere 2 or 3. Why you think you can't hear the stock tweeters? Not only do they suck.. But also its a bad location....
Go with what YOU think would be best, but be sure to put some thought into it if you want a good setup. To each his own