Best is to buy an M.2 to ETH sled so you have the freedom to choose for your preferred router. Openwrt's support for modems isn't that good and your only option is to use ROOter but for me, this one was also far from ideal to use. Some problem with speeds such as USB maxing to 200mbps was also quite common with Openwrt that supports modem+router combo devices. M.2 to ETH sled doesn't have any compatibility issues and most importantly doesn't have the throttled usb speeds (modules usually use USB despite being plugged to M.2) since it runs using PCIE interface. We are also maintaining a project here: https://github.com/iamromulan/quectel-rgmii-toolkit which you can install to have a simple dashboard that will let you control your module. However, it only supports Quectel RM5*** for now. About the router part, again youre free to choose what you want as long as it has a LAN port.
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