How do you address an envelope to two married people with doctoral degrees? Drs. John and Jane Smith Dr. John Smith and Dr. Jane Smith Drs. Smith
I know in public speaking you would say 'Good evening Doctor, Doctor!'
I would use:

Drs. John & Jane Smith
Teachers: We supply a list of EFL job vacancies
I should point out that Michael is infact a Dr. himself.. (They get all the girls huh!)