I have this app https://apps.apple.com/us/app/... and it's incredibly unreliable... Any thoughts on something better that's current? The other suggestions I've found seem to be out of date/no longer available. 

I'm using this in a dance performance where the phone would be moving amongst performers, so a wireless set up is needed.

The native continuity camera works well except there's no way to see the image any advice appreciated!