There’s more to it than sliding in a M.2 SSD into a Mac system.

Apple uses a proprietary blade interface so you can’t use a M.2 drive. I would recommend sticking with either one of the custom Apple drives listed here The Ultimate Guide to Apple’s Proprietary SSDs jump down to Generation 2 section. Or, go with either one of the third party drives made by OWC to Transcend

Last issue here is you can’t use the faster PCIe/NVMe drives as the systems interface is only SATA based.