Seems to be a contradiction in your question. By mobile router, do you mean:-
1. a 4G or 5G modem with a wireless access point piggy-backed on to it (described as mobile broadband by most operators).
2. A compact router that takes an ethernet connection and makes it wireless, used for travellers in hotels mostly?
You won’t get either of the two options above in a base station and satellite format.
To be honest, if you’re getting glimmers of 5G you’ll probably be able to average speeds >100mbps on 4G so that’s the road I’d be going down. You can probably sign up in an EE shop and walk out with one of their 4G routers, which are pretty good.
But then you’ll need to plug it into something else to get wireless further away, so budget on a pair of mesh stations too (the Google Wifi stuff is on offer at the moment).