umm... The time it takes to administer the test alone is prohibitive to its use as an employment tool. Interpretation needs to be done by a medical professional.
I've seen Myers-Brigs (and its various permutations) used in employment situations. But the MMPI or MMPI-2? Again the data would be useless. Especially the MMPI data as it needs a pro to know what parts of that test are still relevant and which parts can be thrown out.
Finally, to be repetitive, the MMPI and MMPI-2 are nothing like a myers-brigs assessment as they are diagnostic tools, no pat personality tests.