Epic Online Services (EOS) voice interface - voice chat

I’m very interested in integrating the Voice Interface system into our indie free game.

Did anyone test it? I read about the limitations of 16 users per room and 50 request user/minute. I dont undestand what that means. I have an open world game, I would like to allow people in proximity of 15 meters to voice chat. In this case the “room” will be very dynamic as people can move around. The idea could be to create a new room whenever two players are next to each other, and then add/remove people as they approach or leave the area.

I will also need to change the volume of the voice based on the 3d distance between characters.

Did anyone test any of this?