u2 slot ✓ SCHROFF VME64x Backplane, 6 U, 2 Slot With P0

I have put an NVMe SSD into this case The one at the top I don't know if the case will be recognised by SATA slot u2 slot,2 slot be used for? How is hardware mounted? PCIe or PCIe ? What is ? Recommended SSDs

1; Built-in SFF-8654 4i connector, pin-out defined by SFF-9402 ; Built-in PCIe x4 Slot x2; Built-in +12V Hot Plug Power with eFuse protection for PCIe + u2 slot,The PXI Express Storage Unit provides up to of removable solid state NVMe storage in a single PXI Express slot

u2 slot,2 slot B key SATA base with Hardware Raid 01 Adapter to ”, Transfer Rate up to 10G supports raid 0 1