All I can read here is Peltor which today stays far behind the CeoTronics wireless technology. Range of peltor? Up to 10m. Range off CT? Up to 200m.
The only bad thing is the price.
As for >2 pushback operations CT provide duplex communication, they hear each other LIVE but the pilot hears only the one who pushes to talk.
Test it, they will surely come and show and even loan for free (I had them for month).