A Balance Two is a solid choice for that requirement. That is what I use at home. (Cable + DSL + WISP)
You could add a cellular modem to the USB port later on.
In my campervan I use BR2 Pro with Starlink RV plus other wans. (2x Cellular + Starlink + WISP)
I use Speedfusion with home and with my van setup. Zoom and gSuite go over speedfusion. I never have drop outs.
You can also do basic failover with Peplink devices but zoom sessions will fail+reconnect when one WAN fails. You need to be using speedfusion to get no drops.
I have my parents setup with standard Starlink and they have LTE backup which is very solid. They dont care about sessions dropping and reconnecting so they dont use speedfusion.
Factor buying speedfusion add-on license into your Balance Two purchase. For reliability your going to want it.