Congrats !!
Enjoy your ride with good music
Nice choice.
Did the front speakers come with crossovers ?
I personally feel a coax or full range ( like yours) speakers in Rear would be better to emphasis vocals. Too much treble ( if two components - one at front and another at rear ) can sometime ruin the music. But depends on your taste. I have seen many cars with more than 4 tweeters - but was never surprised . Everyone has a different taste - especially when it comes to 'audio'.