drum riser feet

[hemiboy]

I have read countless posts on this topic here and on other forums and I still am not sure about one thing. I am using  mdf boards with tennis balls and sorbothane feet. The sorbothane feet are half circle stick ons which are ok. But my question is this, Being a 4 by 6 riser holding just the rack snare 2 uppers 13 and 14 a floor mounted 16 tom and three cymbals, not the throne, would I want  to have wider sorbothane feet like  2 and one half inch wide  by about one inch hi or go smaller like 1 inch wide by say 3/4 hi? Not sure about the weight distribution thing  on these feet