Dual M.2 PCIe NVMe Adapter Without PCIe Splitter Function (PCIe Bifurcation Motherboard is Required), Support M.2 PCIe 4.0/3.0 SSD Soft RAID Setup in Windows/Linux
WD_BLACK™ AN1500 NVMe™ PCIe SSD Add-in-Card | Western Digital
Quad M.2 NVME SSD to PCI-E 4.0 X16 Adapter, High Speed 4x32Gbps Soft Raid
RAID Storage With SSDs - Sabrent
Amazon.com: StarTech.com 2x M.2 NGFF SSD RAID Controller Card plus 2x SATA III Ports - PCIe - Two Slot PCI Express M.2 RAID Card plus Two SATA Ports (PEXM2SAT3422) : Electronics
Highpoint Updates NVMe RAID Cards For PCIe 4.0, Up To 8 M.2 SSDs
Building a PCIe 4.0 RAID array is stupid fun | PCWorld