Unfortunately, the answer is generally "no."
Most of these devices do not have an Ethernet port, so there is no way to connect the Gateway Hub to the MiFi.
If your device has an Ethernet port to which you can connect a computer , however, you may be able to use it as the router for an AyrMesh Network. We are not aware of any devices that have Ethernet ports, however.
NOTE: We have worked with the Franklin Wireless R526A modem/router, and it DOES have a working Ethernet port that DOES work with the AyrMesh Hub2. It's not a common device, but, if you have one, it WILL work with the AyrMesh network.