Reddit reviews Bay Marine Supply Busbar – 10-Point Power Distribution Block (150A Rating) - #8 Terminal Screws & Two 1/4" Studs – Pair of Red & Black Bus Bar (with Complimentary Electrical Grease)
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Complimentary electrical grease (7g tube) is included to help prevent metal corrosion and gallingMax Amperage: 150A @ 12Vdc –– Max Voltage: 48VdcConnections: Two 1/4" Studs with Ten #8-32 Steel ScrewsDimensions: 1.5 x 6.005 x 1.250 inch, (1.75 x 7.193 x 1.686 inch with cover)Nickel plated brass contact plate & stainless steel connection posts
You can just get a small proto board (with the grid of metalized holes) and put two rows of male or female pin headers or screw terminals on it, and then solder all the underside pins of each row together. Connect one power supply wires to each row, and whatever else you want goes on the other pins. Cheap and quick, if you have the parts on hand.
Alternately you can buy parts called "power busbars" if you want the more-expensive, professional looking method. These are usually made for higher currents than what you need here however-- https://www.amazon.com/BusBar-10-Point-Distribution-Terminal-Screws/dp/B07FPN71NL
A DIN rail is a wall-mounted metal rail that a certain type of enclosure mounts to. It's not what you want here. You can almost certainly get DIN-rail power bussbars, but without a DIN rail to mount it on it's rather a waste of money.