Occupying M2 slot on the motherboard with SATA SSD

So I have a bit of confusion here on which Slot do I use Motherboard manual says following -For 3rd gen AMD Ryzen Processors, the _1 supports PCIe

But even with official server mainboards in case you have a dual NVMeSATA slot on the mainboard, most of the

m2 nvme slot Für die meisten ASUS und ASROCK Mainboards m M2 Gewinde für die Installation v Speichermodulen

m2_1 slot INSTALL NVMe SSD IN NO OR SINGLE SLOT MOTHERBOARD