We bought a D-Link DWR-M920 and an D-Tac 90 day internet only sim to connect.
The router has 4 LAN ports, 4 antennae (2 cellular and 2 wi-fi), but only 2.4Ghz. No 5Ghz channel. It can connect up to 32 users, but that might be a challenge on 4G.
It'll only be used here, or on other jaunts away from home, so right now, we don't need all-singing-all-dancing future proofing. We can make our own choices if we want to do that in slow time in UK.
So far, we have connected 7 devices to it and had 6 streaming at once. It took a few moments for each connection to settle, in terms of picture quality, but that's fine.
We have streamed UK TV via our UK VPN router (connected to the D-link by LAN) and the VPN is there and robust. It is just plain old convenient to have an always "in UK" option without fiddling with settings etc.
So far, so good, although obviously use so far is very limited.