M.2 modem for RBM33G

Has anyone tried to install an M.2 modem on the RBM33G platform? Does RouterOS support such integration and with which modems?

RBM33G m.2 slot has only PCIe connectivity. Most modems are USB peripherals, it will be hard to find supported modem with PCI connectivity with correct m-key, we have some PCI modem support in RouterOS, but it would much easier to use mPCIe or USB slot for modem.