Will the Matrox DualHead2Go be the appropriate product for this setup: I want to attach two external monitors to my iMac.. One on each side of the iMac. I'm pretty sure that DualHead2Go would work for that but just want to confirm before purchasing. Also, since the DualHead2Go makes the computer think that only one monitor is attached, will I not be able to set the display preferences to properly reflect the monitor positioning (i.e. one external monitor on the left and one external monitor on the right)? Thanks in advance.