Possible ways to connect two SSD at a time?

NVMe PCIe 2280 Solid State Drive, Gen3 x4 SSD Solid m 2 slot ssd This video explains how to select which slot to use on a motherboard for the best storage m2 pcie slot An SSD is keyed to prevent insertion of a card connector to an incompatible socket on the host The M

m2 sata slot 2 SSDs are keyed at both M and B positions, so they can fit in SATA slots and PCIe , even if they might not work in the latter NVMe SSDs are keyed only