4x Expansion Board vs Single PCIe x4 NVMe Drive

QM2 Expansion Card Hardware Specs m2 expansion slot Expansion Card, NVMe to PCIe X4 X8 X16 Converter Card with Aluminum Heat Slot Riser Card Extender Extension Ribbon Flex Relocate Cable 20cm m2 slot screw 2 slot support NVMe? Does the slot support Intel Optane? XPC cube SH55J2, PCIe x16 , PCI 32-

m24 slot -Is it possible to split an slot into 2 or 4 slots? Some motherboards do support PCIe bifurcation, but even on systems that do support