Regarding the Summit fuse block: That does look quite nice and I'll bet it would keep things very tidy. I think it holds blade type fuses. I have seen some of this sort of fuse block come with or have available a bus bar terminal strip that will connect together one whole side of the fuse block, and that is where you would connect the power going in. I can't tell if this one has that. Something like this.
I'm not sure if you could buy something like that separately.
If it does not come with one, it's not a big deal because you can just solder multiple terminals onto your input wire.