to answer your question:

starting with the power wire at the battry terminal-
-fuse (size will depend on the amperge of all the amps)
-firewall
-trunk
-cap's + terminal
-fused d-block
-power wire to each amp

you can ground everything individually or at the same grounding point.

what two amps is the cap going to. the cap may be no use to the amp that is powering the mids and highs. they are for amps that power subwoofers.