I have a home office and depend on my internet connection for income. In addition the industry I work in requires fast response times in some cases. MY ISP goes down I lose work and sometimes customers have serious consequences if I cannot make changes quickly. Tethering my cellular device is a solution but I am looking for something more permanent/seamless and flexible solution. A second service from the "other" provider is not possible due to wire sharing and incompatible technologies.
My thoughts are that a “cellular modem” like my cable modem connected to my already owned dual WAN routers (RV042 Linksys and a Watchguard Firebox, I am not using both just mentioning what I have) matched to my 4G LTE wireless service where my plan has a larger than we need data plan so an occasional fail-over would not be a problem would be ideal. My problem is locating the proper equipment. My carrier offers a device that might work but my use case is not its intended purpose and this would necessitate a new router as it is USB only, no Ethernet.
I have located an article or two here but hours of searching have produced no fruitful results for devices because I am not exactly sure what I need in my particular mix of equipment/needs.