Can I use an 2nd (or even 3rd) Apple TV device in our entertainment room that has multiple TV's

Question

First of all I'm wiling to buy as many apple TV's as needed, so my question is not about how to do everything with one Apple TV device...but rather how to get multiple Apple TV devices in the same general location of the house to work without interfearing with one another. We bought a new (2nd) TV for the entertainment room so that our kids could use the 2nd TV for putting stuff up (via Apple TV airplay) from their phones and ipads...and still watch TV on the other TV.
Well, it turns out they often don't want to watch TV but rather use airplay from different devices on BOTH TV'S. Currently, we have one (2nd or 3rd generation) apple TV already and one problem/issue I have noticed was that if someone (Watcher #1) was already streaming to the Apple TV via airplay...a second person (Watcher #2) using a different device (iphone, ipad, etc) could send something via airplay to the same Apple TV which would automatically "override" and cause Watcher #1''s program/video/pic to stop and thus allow Watcher #2 to start watching...much to the annoyance of Watcher #1. (With 2 kids you can just imagine the arguing and fighting that goes on)
So, besides trying to eliminate this "battle of the airplays"...I'm curious if we buy a second Apple TV for the same room...how can we hook it up so there is no conflict...and how will which apple TV know which device is trying to to send airplay to it. I get the feeling that that we will end up with 2 TV's playing the same feed from one device...unless there is a better and more proper way.
Also, I would like to add a3rd Apple TV device to the TV in our home office so that I can use as well...but because of the close proximity to the entertainment room...I fear that if I try to send a feed to the apple TV in the office it will start to play on the TV's in the entertainment room.

Answer 1

You can have as many ATV's as you want, but I STRONGLY STRONGLY STRONGLY encourage you to use wired connections on all of them.  AirPlay is a god awful bug ridden failure prone feature under the best of circumstances.   Using it over WiFi is much worse.  And the band width load of three different devices connection to your WiFi access point to three different ATV's (total of six concurrent connections) will very likely over whelm your WiFi hardware.  
I actually encourage people to always use a wired connection with ATV in general.  It saves a LOT of head ache and frustration.  With three it is even more important.   As far as controlling which one you connect to.  They are three separate devices.  You select which one you want to send something too.  So if you want to send something to the one in your office then just select that ATV.   It would probably be good to setup their names to be the location.   So something like "Office Apple TV". 
As far as kids being brats and intentionally interrupting each others AirPlay connections...   Well there is only so much Apple can fix.  If someone else on the network that has access is deturnomand to be a jerk and interrupt someone else content they would be able to.