I'd just use the tripod for the time being until you figure out how deep that slab is... Chances are its less than a 4" deep. even if you used dynabolts to bolt a steel pier onto that, I dont know how much I'd trust it to hang on if you bumped into it hard etc.. All depends on the base of the pier though I guess....
For the time being, use the tripod, just mark the spots on the ground where the mount sits, that way if you bump it you can put it back pretty dang close without much hassles...
Alex.
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