amp install

So I have an 07 Buick Lucerne CXL and I wanted to do the big 3 upgrade. I want to run 2 15s on an 2000W mono (preferably Memphis although I haven’t used them before) and a 500W-1000W 4 channel for the 2 door speakers, 2 rear deck speakers, and 2 front pillar tweeters. I was also thinking about...

Where is the best place to run 0 gauge wire back to the trunk for an amp? Will it fit in any channels under interior panels or do I have to run it down the frame under the car?

I have a 2017 Buick encore I was wondering where a good location to run a zero gauge power wire would be. I don’t want to cut a hole in firewall ! I do know in the back where most people run the trailer hitch wire would be a good spot for it to come out in the back. But I don’t know about up...

All, Looking for some solid info on where to tie in my Line output converter on a 2013 Buick Lacrosse. I do not have the rear 6X9s and no amp on the passenger side of trunk. I see a box on the top of the rear deck in the trunk but not sure what this is. I assume I need to tie into the rear...