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I'm a fan of the marine battery terminal fuses. It keeps the fuse as close to the source as possible. You always have to keep in mind that the fuse is there primarily to protect the wire. Any unprotected wire is a potential short and fire starter.

In commercial 24V vehicles the solution tends to be battery equalizers. It allows you to draw more power and keeps the batteries in good balance. They tend to be 2-3 times more expensive than the converters but are available in higher amp ratings. Eaton SurePower is one of the major brands,

Yes and yes. The traditional automotive setup is to use the body and or frame as the ground. In practice that means getting a good clean connection and protecting the connection area from corrosion. A great many electrical issues in cars and trucks are caused by bad/dirty/corroded grounds...

I use bus bars from Blue Sea. Available in many configs. They're relatively cheap on Amazon. https://www.bluesea.com/products/category/18/BusBars