Question about NZXT N7 Z790

The mainboard has an M.2 interface, which is listed as an internal interface. However, there is no exact information about the number of M.2 slots in the data material provided. According to official information from NZXT, the N7 Z790 has three M.2 slots, two of which support PCIe 4.0 x4 NVMe drives and one of which supports both PCIe 4.0 x4 and SATA.