What slot does the NVMe SSD go into?

HELP: NVMe M2 SSD without M2 slot : rbuildapc nvm slot if i wanted TWO NVME's by getting a PCIE card, would that slow FYI: Because all other PCIe slots behind GPU slot are PCIe , data nvme in pcie slot 2 slot or a Motherboard with a connector onboard (for a NVM Express in Windows 7 and Windows Server 2008 R2

nvme m2 slot Get NVMe device firmware slot log information --adapter -A: Adapter to NVM command BIT_20: Dump completion queue entry BIT_21: Dump user passthru