NVMe x4 adapter card for PCIe x1 slot

how to tell how many nvme drive slots a motherboard has? nvme slot types Does this mean I am able to insert a B&M key SSD with 2242 form factor in this slot? If yes, does the slot accept NVME or SATA or both types of nvme vs m2 slot difference Acer ; Acer Aspire V Nitro , 1x 2280 PCIe NVMe ; Acer Aspire V15 , no slots ; Acer Aspire Vero , 1x 2280 NVMe slot

nvme slot types 2 connector, more than one type of interface that can be used with M The Intel SSD is keyed for slots B and M, so it fits in the right slot