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Hi, it really depends on your ground. My yard is hard compacted sandy loam with decomposed granite. My pier base is 350mm x 350mm and about 600mm deep, the pier is 1200mm tall and carries a NEQ6 and 10"f4.8 newt. Its been 2 years and no movement yet. A pier is a lot more stable than a tripod so really you cant go wrong whatever you do.
A word of caution regarding driving steel into the ground then pouring concrete on top, when the steel eventually rusts it will expand and crack the concrete (google concrete cancer), exposed steel is a big no no in professional concreting.
Rick
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