The reason that three is better than four is that three points define a plane. This means that it's virtually impossible to have four points equally support something. This is why a stool with three legs won't rock but ones with four almost always do. If the legs can be adjusted then I'm sure that it's possible to set things up such that it really doesn't make a difference.
Nordost recommends putting three sort kones in specified locations under equipment and then moving the 4th around looking for the "low" point.
Nordost recommends putting three sort kones in specified locations under equipment and then moving the 4th around looking for the "low" point.