Distribution block?

[DFA]

Hey YW, it's me again.

I'll most likely be running amp wires thru my Yaris sometime this week. I'm still not 100% sure which amps I'll be running, but it'll most likely be a TMA T2-500.1 to power my sub, and and a Powerbass ASA 600.4 for my speakers. I have a couple of questions.

So, from what I've read, I think what I should be doing here is routing some 0/1ga from the battery into the car, and then split it into two 4ga wires, each running to each amp. 4ga will be used for grounding each one as well.

First, my door speakers are 50W RMS, feeding them 100RMS won't kill them unless I get stupid and overload them right?

Second, would I be better off with running 0/1ga or would 2ga be enough?

Third, is it really necessary to use a distribution block? or can I just run a fuse rated half as big as the one on the 0/1ga coming from the battery on the 4ga wire going to each amp?

Thanks in advance