I need something that allows me to run two PCs through a VGA splitter to two projectors (identical images). I though I could just two splitters combined with a female to female adapter on the inputs, but it creates a double image. Is there a switch that will automatically change to the active input or set priority to one input and ignore the other? These projectors are in a church on the ceiling and we need an input at the front and one at the back of the auditorium. Thanks in advance for all your help.