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2.1 metre walls equates to a peir of about 1.3 - 1.6 metres if you want to see near the horizon for drift alignment purposes.
My obs is about 1.9 metres tall - dome roof, so I can't get lower than 25 degrees to the horizon using a 1.3 metre pier. So on drift alignment or initial targeting is the only concer here. As stated you won't do any real imaging at this elevation.
Personally I like the peir to be as short as possible - to minimise flex / vibrations. I agree 1.5 - 1 metre would be a reasonable well depth to sink the foundations into the ground - more if the ground can shift easily.
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