2013 & up amp install

Getting ready to install a jl hd 900/5 amp in my new truck and was looking for advice from anyone who has done this with 13 & up with mft. I installed systems in my last 3 trucks using standard line out converters. I have an lc2i for this install. Where should I grab my signal from on this truck? From what I can tell, I should be able to send the signal back out to the front speakers from the jl amp right at the DSP?

Any help would be appreciated. Thanks

My plan is to run the jl amp to the factory door speakers and sub. I will put poly fill and an aftermarket sub in the factory enclosure. I may even run the factory sub off of the jl amp just for a trial run.