Out of NVMe slots? This PCIe SSD enclosure adds one more for

slot free in it ? I read somewhere than Yes, it has two slots for M2 PCIe NVMe SSD such as the M2 Samsung 970 Evo Plus or similar

Dual 221102280 PCIe NVMe SSD expansion card ; Bracket, Low-profile Low-profile flat and Full-height brackets are also included

pcie slot height is a slot that can interface with SATA , PCI Express

pcie x 16 slot Drives that use NVMe were introduced in 2013 to attach to the Peripheral Component Interconnect Express slot directly on a motherboard