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Yeah, my boot drive is one. I have a cheaper SSD as a data drive and was just going to add another boring SSD because that's easiest. I presume I only have a single M2 slot.
https://www.gigabyte.com/Motherboard/GA-Z170MX-Gaming-5-rev-10
1 x M.2 Socket 3 connector (Socket 3, M key, type 2242/2260/2280 SATA & PCIe x4/x2/x1 SSD support)
3 x SATA Express connectors
6 x SATA 6Gb/s connectors
Does your machine not have M.2 NVME slot(s)? SATA is old and slow, and not that much cheaper per jigglybite these days...