dmize, when I was doing one amp, I had an inline closer to the FH-44 you listed
single 50 amp fuse, waterproof, taped the ends w/vinyl
that dual block came with 4 fuses, so I requested 40 amp and 30 amp, I'm running the 40 amp, amp spec is 30 amp. I will try the 30 amp fuses eventually, maybe.
a local installer told me you could twist two 8 gauge wires together, and reuse the fuse holder, but you know how that goes.
I've never blown a fuse so far on the bike due to the rockford amps.
those amps drain the battery quicker with two of them, but not so bad.
saddlebag lids pull a bunch of bass, which pull a bunch of power.
maybe not worth mentioning, but had a crackle in right output, second amp, when I was installing and adjusting fade, first time running it, dialectic grease in the amp output 4 plug connector, fixed it.