Agree on 1: it’s not a power board. It’s a low profile signal relay board; I/o etc. It has only one gold pin port. Most of the power pins are steel, and a few tin signal pin ports, eg USB ports. This one is definitely low unless it has a massive amount of ICs on the back.. which is unlikely.
2 has two gold pin ribbon connectors and ICs. We agree again.
I believe 3 has a small gold port on the underside? This is already on the border of peripheral. If there a small round gold port any anything other than steel on the other side it will clear peripheral.
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