fuse holders

5000 watt orion amp, 370 alt, not sure if i should use 1/0 or 2/0, and i think 500 amp fuses. Trying to figure the best way with the Least amount of fuse holders, as they cost a lot of money lol.  Is this the best way to run the wire?  And do i need the fuses in those 3 spots?    Do i need...