Adwiegert, there will soon be a recommendation of using four new Magnetrons, all on the front or speaker wall, and one new Bass Station for your rear wall. The new sidewall, Magnetron position does wonders.
All that I can say about MIG positioning is to try alternatives. If you move them under a component, do so smoothly. These things don't like to be moved. I have found there to be little to predict what will be best other than to have about the same load on each foot. After they are broken in (yeah, I know that sounds like nonsense for footers, but it is true), I prefer the "pin-point" position. I again tried putting three under my Mac Powerbook that I use as a server. I am again shocked at how effective these feet are.