How to create the concrete footings, for a small arbour, using embedded post anchors

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Good Evening Folks

I would like to construct a small arbour say 2metres by 3 metres and 2 metres high. Posts say 90x90

This question is about creating the right footings for the post anchors

Am considering post anchors which will be embedded in concrete

Question is what are the right dimensions for the concreted hole which will have the post holders embedded

All advice welcome

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