Here is my setup at home if anyone is interested?
I originally only had ADSL at home but because of the lockdown I needed to come up with something else to give me and the others enough bandwidth to use and live with.
I decided on a 4G Max mobile broadband SIM from Vodafone and tried several 4G routers before deciding that the Archer MR600 router was the best for me. I also purchased an Eightwood 4G antenna and installed in the loft with the Archer MR600 router.
The Archer MR600 router has beta firmware installed, so I can configure which bands to use for 4G+.
I then had to come up with a solution to use both of the ADSL and 4G links and make it resilient incase one of them failed. Funny enough the solution was a TL-R470T+ load balancing router. This allows me to load-balance traffic using the bandwidth available on both links. It looks like I currently get 3:1 load-balancing ratio in favour of the 4G. You can also configure online WAN detection for each link, so if one goes down the traffic is re-routed over the other.
I pretty much only use the firewall as an 8 port switch, but it is occasionally handy to look at the firewall logs to work out what's happening when something isn't quite working as expected?
I also have a WiFi mesh setup which works really well