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I think a USB port can't be installed upside down on a desktop or laptop because the USB port has connector inside the port to connect it to wires and circuits on a card, so the plastic piece on the USB port is usually on the top, and the empty part is on the bottom.
Those sideways USB ports can be harder to plug in.
I see, I guest finding the right directions for USB ports on tablets with fullsize rectangle USB ports can be hard as well because people sometimes have the tablet on the sides on a stand, facing the ceiling, or facing the table.