Clients were a mix, one SSID is on the same VLAN as the Apple TV's the other 3 on seperate VLANs, but they are not NAT as there is a L2 switch handling the routing and VLANS.
In the end with the help of Aruba I managed to get all the 8 apple TV's showing on the airplay of the device, this was achiveved with a firmware downgrade. I am still yet to test the airplay fully and see if its usable and quick.