high level install with multiple amps

Im going to be doing a very basic install on my truck. im wanting to keep everything minimally invasive and the cost down. Ive never done anything with factory decks.

In this case im utilizing the factory deck which i plan on using a parrot harness that will give me access to the speaker level inputs without chopping up the factory harness. If i connect a kick hideaway sub utilizing the speaker level inputs on the rear and also tie a small alpine power amp into the rear/front at the parrot harness will that present a problem? basically i plan on connecting the parrot harness wire, a kicker hideaway wire and the alpine amp rear wire all together for the rear +/- speakers. To my understanding the front should be fine since its just the alpine amp going out to the front speakers.

if there is a reason not to do it this way what would be the ideal way keeping minimal equipment/cost. Im not interested in using a DSP.

thanks for any insight.

What vehicle are you working on?

2015 f150 xlt crew cab. It has the large my ford touch screen but no sony factory amp.