My first reaction was to support option 1, but after checking out the link you provided, I think option 2 might work better. The only thing that I would suggest is using more than the 6 you suggested. I would probably go overkill and have them installed one per foot all the way around. I think that would be 16 in your case? It's not a question of strength as they appear to be very strong, but more about load distribution. Even on a concrete slab, load distribution is still important and will help ensure that the stand never twists.
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