Can I use a M3 dot with a non-Meshforce router?

No, M3 dot can only be used with other Meshforce products like M1, M3 and M3s. In order to add a dot to your network, they will need to be added through My Mesh app and connected to a main Meshforce point (like M1, M3 and M3s) that is connected your upstream modem or device via Ethernet.