Eric, you might notice in the picture that it is a bigger wire before the fuse block, usually # 4 to 1/0, and smaller wire to each amp. I use 1/0 with a 100 amp fuse to a 4 way fuse bock, then # 6 to each amp. You can't fit 0 into most amps.
I also have my caps on the battery side of the fuse block so that all amps can benefit from the cap, not just the sub amps.
I have all the amp and cap grounds connected at the same point, but others say they should be grounded separately. Whatever works.

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP