One on each side so he can't kick it and have it roll. Plus opposing teams are putting some pressure so he can't roll out longer to allow more coverage time.
I'm with the original poster. Time to scrap Johnny rugby punts and send it out to pasture. It's not working with his low projectory and poor distance, especially because teams have it schemed as I outlined. There's very little chance for any roll with two returners, one on each side. It only works if you have a rugby punter who can boom it like Yewtsh has.