4G LTE.. can you simply get a USB modem from Verizon and plug it in? Perhaps via a USB extension cable so the modem gets elevated a bit?
Or use a Cradlepoint router which has WiFi, Ethernet, USB port for cellular/4G modem, WAN port if you have cable/DSL at some times.
Cradlepoint MBR95 would do. Try eBay for lightly used.
For Ethernet devices that need cellular communications I like to use Sierra or Digi cellular modems. Many of them are full routers that have all the bells and whistles but aren't cheap.