Hi!
Looking at the different Airbox products, they all seem to be Huawei wifi hotspots no?

Huawei E5372s, Huawei E5573Bs, Huawei E5577C

Those all say they have a usb port too, which means it should be able to tether to any of the GL.iNet routers that have a usb port such as the AR750s, S1300. I would recommend one of those 2 as they have dual band wifi.

So you can order a GL router, try to tether it. If that does not work, you can still use your GL router in client mode connected to the Airbox, and supply internet to your IOT devices and connect them together as well.