You guys should look at the new M.2 PCIE 4x USB adapters.
M.2 -> 4x PCIEx1 with usb cables. You can stop using those PCIE X1 things and connect to M.2 slots with USB directly. No mishaps or mistakes any more.
Not bought one myself but looking to try them out if they have better availability. Not seen too many sellers but some in China that take their time to ship.