in the case of your picture, it wouldn't matter, cause there is no ground. If the mug was standing on a table, you would get a shadow for each of the lights, meaning 3 shadows in different directions, which is usually bad, but not always.
( it just doesn't look very good, usually )
for instance : if your in an office with a window, it would be a rather hard shadow in one direction ( on a sunny day, soft on a cloudy day )
but, if your making a stage for instance and you have 3 spots to follow the clown on stage, then you would want the three shadows showing!
it's all related to the setup you want to make.
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