At work I have a datawall, with four monitors driven by a computer with a Appain Graphics card. Trouble is that the computer is close to the monitors and when giving a presentation I have to stand at the computer station to control everything. I am thinking of a wireless keyboard and mouse. However, the area where I want to use the keyboard/mouse is about 15 feet from the computer and not really line of sight. What type of keyboard/monitor would you recommend in this case?