2015 Silverado speaker wiring

[Paramed3]

So I ordered 4 new speakers and a 4 channel amp from crutchfield who helped pick it all out to replace the door speakers in my non bose Silverado. My question is where are you guys mounting the amp and how are you wiring the speakers. My initial thought is amp under the back seat but that means running wires from the dash to the amp and then back to the door speakers. Is this how it has to be done or is there an easier option?