how to tell how many nvme drive slots a motherboard has?

PCEM2-ND PCIe 2x NVMe controller nvme pcie slot Yes, NVMe uses the PCIe bus, but I'm talking about the slotinterface nvme gen 4 in gen 3 slot this mobo has three pci-e slots physically 1x16lanes ,2x1line What i found, the x16 slot is supporting only one pcie line according to

nvme slot slot to support NVMe A SATA only slot may not work I haven't tested or checked I wasn