You mean a metal bracket?
If it's buried, water will get in, but not out, and it will rust.
Post base, galvanised and powder coated.
The spike version is meant for burying presumably
The spike version is for earth, not concrete.
Even galvanised & coated, being almost permanently wet is not going to do it any favours.
How deep are you thinking of burying it? How will you bolt it if it is buried?
@Backstop started
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You mean a metal bracket?
If it's buried, water will get in, but not out, and it will rust.