Absolutely deep, the deeper the better.
Mine was in very solid soil and it was 900 deep and 600mm x 600mm
And the pier was incorporated in it as a steel cylinder 300mm in diameter filled with cement as the whole lot was poured in one go.
Once set a Mack truck couldn't pull it out.
The things is this it is what you can afford and the skills you have.
Mine was probably over kill, but that is what i do, and it was watered in the summer months at the base due to soil drying out and shrinkage
Leon
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