If you want to give them a fair shot, then you're going to have to install them properly.....especially the fronts.
Deaden those doors and make sure the driver is solidly mounted.....I would try them as coaxes first before going to the effort of putting the tweeters up higher just in case you really don't like the way they sound.
They might surprise you at that point, but on deck power only they are being handicapped......at that point you could pull the tweeters and tape or stick them up on your A pillars, have a listen and then decide if you want to mount them there permanently.
If you are still happy with them, adding a decent (50-100WX4) amp will bring them to life.
Still bumpin' after all these years
Kenwood/Focal/AudioControl/RF/JL Audio/Lightning Audio