Students interested in doing a doctoral study should contact the faculties or departments, or directly get in touch with academics and researchers at the institution who are qualified to supervise a doctoral thesis (dissertation). Search the "Higher Education Compass" database by various categories: universities, subjects, subject areas, admissions rules, and dissertation rules.
I would say generally there are no perfect settings for acknowledgements. It all depends to your university dissertation rules. If the thesis/dissertation booklet does not cover the way acknowledgement should be stated then its up to you.
Dissertation rules will follow the national rules
Following this general outline, the dissertation’s overall organization is up to the student in consultation with the thesis advisor and chair of the thesis committee. The written document must conform to the dissertation rules of the University (see the issued by the Office of Graduate Studies).