The Dell OptiPlex 7070 SFF has an M.2 slot that handles both CNVi and PCIe Wi-Fi modules

The Dell OptiPlex 7070 SFF uses a standard M.2 2230 slot for its wireless module, and the slot supports both CNVi (Intel’s integrated Wi-Fi interface) and standard PCIe cards. That means you can drop in an Intel AX200 or AX210 without worrying about compatibility. Nice flexibility from a business desktop.