Best solution for SSD expansion card for NVMe

I DID NOT PLUG THE PCIe ADAPTERS DIRECTLY INTO THE T5745'S EXPANSION SLOT ON ITS MAINBOARD Every time I've posted about this somewhere

Well a M2 slot on a motherboard actually runs on the Pci-e express lanes anyway of the motherboard Using a M2 card on a pci-e expansion card to

m2 pcie slot is a specification for internal expansion cards on PC mainboards and notebook computers was conceived as an successor of the mSATA interface and

m2 sata vs nvme slot And there are only 2 slots, so why can an expansion slot work?