I just found those PCIe card from Asus (ASUS Hyper M.2 x16 Gen 4) for about 50€ where you can connect 4 additional NVMe drives to your Mainboard. Its for my Epyc board (ArockRack ROMED8-2T) but it works also with sTRX40 boards. I’ve put 4x Samsung 970 EVO Plus in a Raid 1 configuration. The storage will be used primarily for the VMs and the Databases. For the adapter to work you will need to change the PCIe lane configuration of the slot from 16x to 4x+4x+ 4x+4x.
