Yes there are several similar styles.
Here is what I use. I originally had side mounted terminals, and liked the design, because the first style I used, would spin, and these were balanced.
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Amazon product ASIN B07T9G2FZF
You can find them with two and I want to say up to to 10. Search the
amazon pages, and you cna find quite a few similar styles.
The only ones I would say to avoid are the SKY HIGH terminals like this:
The set screw (to secure to the terminal) is really small, and won't even hold if you mount em flat to the top. Not a chance if you mount em to a side terminal.
AS FOR THE DISTRIBUTION BLOCK:
I personally still don't get why you would rather use a distribution block instead of just running two cables, but I think what you should do is, go look at where you plan on running that. See where you're going to feed that wire and have it sit from battery to amp. Trying to get through the firewall, might make this decision for you. If I was going to split I would use larger than 2/0 for two 1/0. Depending on how much power you want out of that, 2/0 might be too small.