I stick my tablet (running the companion app; though though if I had an adequately powerful device, there’s no reason I couldn’t run the main app here instead I suppose) into the “tacx bracket for tablets” (the main app is running on my PC across the room)
Pro are that it’s easy to do most of the mundane things in zwift (drop ride on bombs, take screenshots) without the fear I’m going to drop the device on the floor/bike, and it’s not much further to reach than if I had a bike computer stuck on the outside of my handlebars.
Downsides are that there this holder only really works in landscape mode, which the companion app does not make use of (so everything is displayed at a 90 degree angle to what is actually useful). I have previously attempted to balance the tablet vertically with all the supports in as close as they could be to try and prevent excessive wobbling. It did not end well.