Sound Dilemma

[Mountain]

SUP ALL!!

Got a question about sound and speakers. Heres my dilemma:

I got a vx ss. I'm running a pioneer p7550mp headunit, pioneer splits in the front, stock speakers in the rear doors, and a 10inch kenwood sub in the boot. The splits and sub run off a 4 channel rockford fosgate in the back.
Now i've got either 2 way kenwood speakers or 3 way lanzas that i want to put in the rear parcel tray.
Should i run the splits off the headunit and whatevers at the back off the amp?
Should i run the 3ways in the parcel tray cause the sub is dairly small at 10inches, or should i run the 2 ways?
Should i run whatevers in the parcel tray of the headunit?

Thx in advance.

pst not getting another amp or bigger sub at the moment either

[StoneX]

Run the rear speakers from the head unit, leave fronts and sub running from amp.

Ignore that they are 2-way or 3-way, chose the better quality/sounding pair. Cheap 3-ways will sound worse than good 2-ways.

[Mountain]

Run the rear speakers from the head unit, leave fronts and sub running from amp.

Ignore that they are 2-way or 3-way, chose the better quality/sounding pair. Cheap 3-ways will sound worse than good 2-ways.

kk thx man