Old Fart with a question about a 2022 non JBL TRD ORP Speaker Harness?

I am sure this has been answered 10,000 times already, if it has please kindly link to it.

I have a 2022 TRD off road prem with non JBL, with the premium sound package with 8" screen. I have a couple noob questions:

I am installing a JL 450/4, JL 1000/1, PPI deq.8, Orion HCCA 12", Focal Toy165 and 6x9s and a HO 270 alternator.

1. What wiring/speaker harnesses male and female should i use? Metra only has 2020 version, can i use those? TacoTunes, if so which one? I don't want to t tap if i don't have to.
   
2. Does anyone have a schematic or pic of the back of the headunit?
3. Is the OEM head unit called entunes 3?
4. Are there install examples on here that show how to wire through the firewall and down the sides of the SUV?
5. Where are you all mounting your amps? Under the seats or on the back of the seats won't work and i don't want an amp board.

I will take pics of my install process if there isn't any current ones of a 2 amp, DSP, alternator and speaker upgrade.

Thanks,
ALD