Those Keystone wallplates are available in two types. One with the holes integral to the plate and the other the holes are in what is called a Decora style insert (like what Rick has). This allows multiple gangs of inserts with a different number of jacks in each. However, the price for all those inserts can add up quick.

http://i244.photobucket.com/albums/gg14/buzz_065/May15_0011.jpg