For internet, I used a multi-SIM cellular route that could automatically switch between different cellular networks depending on which one was the strongest using a bulk cellular data plan. I also brought a Starlink dish with magnetic feet so that I can stick it to the top of the car if I'm in a place where I don't have cellular connection. The cellular router also supports auto switching to the Starlink connection in that situation.
To round out my setup, I also have a refrigerator. The fridge and router are designed to run off of 12 volts and I got a 12 to 48 volt DC-DC converter and power over ethernet injector to allow the Starlink to run off of 12 volts as well and wired everything to the car battery, with proper fusing of course. My RAV4 Prime has a smaller than normal 12 volt battery, but as long as I keep the car in ready mode, the car has a DC-DC converter that recharges the 12 volt battery from the traction battery. Ready mode also powers the car's heat pump from the traction battery so that I can have climate controls without running the engine.