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My thoughts on piers is that if you can setup a scope on a tripod and get no vibration while imaging then it doesn't really matter how small your footing is as long as the ground is firm enough so your setup wont tip over. Any pier is a 100% better than a tripod.
My pier is in the backyard with no dome so I have alignment markings that when I put my rig back on polar alignment is usually good enough to start imaging a just a few minor tweaks.
My pier hole was 600mm deep and has a small 300x300mm footprint at the top, slightly pyramid shaped at the bottom of the hole. My ground is fairly hard I needed a crow bar to help dig it.
Rick
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