From my own experiment, the EP0 works well when placed on the desk without much more distance from the listener than the M0 (which does not look very convenient for you according to the picture you nicely provided--BTW, white works well with the MAC!).
In this case, you might want to consider a small separate sub (with its own amp and controls). I am not the greatest expert in alternatives for the EP0, but there are plenty of people here who can recommend some, including the EP125 and EP175 from Axiom.
If you can place the EP0 as I mentioned above, it actually blends splendidly with the M0s. I even watched a Blu-ray movie last weekend on my PC and the desk was shaking!
