My own view is that everything should run in neat clear lines.
Mine has a safety trip / kill switch under the bonnet rated to 120amps
0AWG cable then runs back to a distro block which splits the power into two 4awg cables. ( you can see it coiled up just behind the seats although not connected in that photo)
Those 4awg cables run to two dual fused distro blocks which have 2x40amp fuses in one and one 60amp fuse in the other.
The two kenwood main speaker amps run a 4awg feed from each 40amp fuse
The kenwood mono amp takes one 4awg feed from the other block with a 60amp fuse.
If i get a fault at the battery end, the power will trip out.
If i get a fault with either amp, it will only blow the relevant fuse and not blow anything else.
I think you can see what i mean here;