Your career is too important to spend your time looking for a job on a variety of sites. If you were sick you would find the best possible doctor. You should do the same thing with your job site. There is no better job board in the world for legal professionals: LawCrossing shows you jobs from every single employer career page, job website, association website
Companies running multiple ads are hiring in general. Send your resume and cover letter to the head of the department you want to work in and indicate you heard there may be an opening.