Well I'm not going to tell you not to experiment a bit, what you like is all that matters since you have to listen to it every day
I'm just making a sugestion. That said I didn't realise you were going to use the factory HU, which changes things.
Usually you'll find kickpanel mounted tweeters in kickpanel mounted pods with another driver as a component set. This is the easiest way to go and a big improvement over stock. It also doesn't require you to gut out your car and cut holes in the interior parts. Separating the tweeter and the midrange driver can be tricky if you don't have time correction built into your head unit. So unless you are getting pods and mounting both parts of the components in the kicks you may be creating a new problem as you're solving the old one.
If you plan on using the audiophile head unit, I would try to keep the tweeter within seven inches of the midrange, in the same panel inside the door even. Then when you replace the head unit with one that includes time correction look into moving the tweeters to a new location. For now it will create a slight echo effect to have everything so far apart. I have six channel time correction through my HU allowing me to tune for the location on every speaker in my car, if I shut it off things sound very different.
In any case have fun with the install and welcome to the hobby.