What you want is some sort of modem/router/gateway/bridge/access-point that connects Ethernet or WiFi to the Internet via cellular. It does not need anything special for the T7 as the T7 is a standard Ethernet device (and WiFi on the T7-Pro). I would suggest searching for "cellular router"
A few of the first items I found that seemed to have wired Ethernet are:
These have an Ethernet port that should connect to the T7, and a USB host port where you put in a USB Cellular Modem that you get from a cellular provider.
You also might be able to get a cell router from a service provider. There are lots of options for WiFi to cellular, which is generally called a "hotspot" (e.g. Verizon Jetpack or even my iPhone can act as a hotspot). Not sure about options for Ethernet to cellular from service providers.
If you want Ethernet connections and want to use a cellular hotspot that only has WiFi, you can have it connect to a router that has WiFi and Ethernet ports.