Supermicro sells single-CPU servers with 24 NVMe bays. Not a big problem if your CPU has 128 PCIe lanes. You could get 12 quite easily even on consumer hardwar

Supermicro sells single-CPU servers with 24 NVMe bays. Not a big problem if your CPU has 128 PCIe lanes. You could get 12 quite easily even on consumer hardware. AMD Threadripper gives you 64 PCIe 4.0 lanes (so up to 72 with the TRX40 chipset), so you just use three PCIe x16 expansion cards each providing four NVMe 4x slots.