Let me preface this with some context, I'm making a PvP server and wanted a sort of Targets/Recoil training area like other servers have to keep up with what players like.

So I have made an area in which I would like the targets to take place, however i know that when more than one person uses it cramming will become an issue and it will be very annoying to players. 

Which brings me to my question; Does anyone know of a plug-in which will turn players invisible to each other in a set area or give me entirely  separate instances of the same area (which would be prefered). 

Thank you in advance and I hope you understood my crudely asked question, if you have any questions feel free to ask and I'll do my best to answer them :)