Dennis, I would get a 120 VAC to 12VDC adapter like this: https://amzn.to/3Gjb4AN, and a terminal block <https://amzn.to/3IpVu8r>. Snip the DC plug off, strip the wires, use a multimeter to determine polarity, and then wire it to the distribution block. You could throw a fuse in line if you're cautious but given you just want to use it for testing, I think the internal fuse would suffice.
Cheers,
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