(1) That has already been mentioned.
(2) That has been already mentioned.
Question: Which is correct? If both are correct, which is more common?
I'd use (1). I would not use (2). That said, both are grammatically correct.
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I'd use (1). I would not use (2).
That said, both are grammatically correct.
The basic rule is to place that adverb after the first verb in a multi-word verb phrase, i.e., after the first auxiliary verb. I don't see any reason to do otherwise for this particular sentence.
Besides, Google Ngram can't find any examples of (2) in its database.
CJ