Maybe it's thin enough that you could squeeze it onto the back side of the motherboard? It would be annoying to build that way, but there's plenty of space there.
It may be annoying to assemble the machine with memory modules on the back of the board, but as far as manufacturing the board this connector is ideal for putting memory on the back: it's just exposed pads on the motherboard, no soldered connector. So it's even simpler to manufacture than something like putting a M.2 slot on the back.
