StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive to U.2 Host Adapter - M2 SSD Converter, TAA

You need an HBA like a Lenovo 430 16i you can run 4 u.2 drives one of those. It takes a. x8 pcie lane. Use this thing that converts your m.2 into a u.2 enclosure: https://a.co/d/04yZwf6N Don’t forget cables: you will need one for each drive. they are fat. https://ebay.us/m/PRYm34 You will never find an external like you want u less you jank up an external HBA