I use now 2 Asus VG248QE on a Aten Dual-DVI-Switch and look for a 3 or 4 VG248QE on Displayport.
AngstHab
Dear AngstHab, thank you for your information. It's not likely that connecting an MST Hub to the Aten-KVM switch will work because MST Hubs need to be connected to the native DisplayPort output of the GPU. What is the configuration of the system you are using? Thanks.