LTE modem?

[Michael Sierchio]

I'm looking for solutions to support a 4G (maybe 5G?) backup internet
connection.  The policy based routing / multiple FIB / firewall rules I
already have in place.

Any recommendations for an LTE modem?  USB or maybe Ethernet?  I do have a
PCEngines box with an available miniPCI express slot, but I'd prefer
something simpler.

Thanks in advance.

-- 

"Well," Brahmā said, "even after ten thousand explanations, a fool is no
wiser, but an intelligent person requires only two thousand five hundred."

- The Mahābhārata