Got the power wire in.
The OEM battery has a fused terminal which has and empty spot with a 60 A fuse that just so happens to be what the Zapco ADSP-Z8 needs.
So I got a ring terminal and crimped the wire, got a 10 mm nut to hold it in place and used wire loom to make it look oem.
Used the OEM positive terminal cover and it looks like nothing happened.
In case I blow the fuse, the entire fused terminal is $23 dollars and I ordered a new one just in case.
Ran the wire into the cabin via the OEM plastic boot.
Zip tied it in place with the OEM wires.
The run from the battery to under the driver seat is under 6 feet.
As a side note, I was surprised to see what Mazda did to quiet the floor.
J.