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Is the floor already constructed? If not you can cast in a support or spur.
Fences are subject to strong lateral loads from wind and will try to loosen and wrench out fixings.
I used stainless coach screws into giant plugs for my shed posts, but for a fence, 8mm studding fixed with resin will be stronger.
Once fitted, you will not want to take it out for replacement, hence I say stainless studs, washers and nuts
And paint the steel shoe with oil-based anti corrosion paint before fitting.