I used to have two Internet providers at home (DSL+Cable) for redundancy reasons, since I work from home. But for several years now I use mobile hotspot as my “secondary” service in case of an outage; the few times I’ve needed it, it’s worked fine.
Of course you need a good signal at home (which I have) and the bandwidth & plan need to support your requirements.
It’s a dirt-simple thing to test, though. Connect to the hotspot and try working solely from that for a day.