Where to pick up power

Engine noise in the harness that you hear in the radio is from where rca's are run with or really close to a main hot wire. I wouldn't worry with that unless you have amplified sound system. Otherwise run 0 gauge with a fuse and call it good. Moved mine to the trunk with monster cable. No issues and I'm running a four channel amp as well. I just run new wires from alternator to the battery, then battery to switch and fuse block. Super simple