I had a home broadband which gave me around 20mbps and a unlimited mobile with a full signal (I can see the mast from my window) this gave me about 100mbps, the 20 mbps home broadband was solid it didn’t buffer at all, I thought my mobile connection would be fine to use as it was about 100mbps but found it would buffer frequently. When I run a few speed tests I noticed the speed was very much up and down.
I am not sure if there is a contention ratio on these connections to 4g/5g home broadband routers, like they have on typical home broadband to make sure of a solid connection, but give it a try on your mobile and let us know how it goes.