Welcome to the Q&A Forum

I would send each agent a questionnaire.  It would be an email or webform with fields that can be extracted.  It would contain questions about the employee's education, experience, and a couple optional personal items.  This will give unique content about the agent. The questionnaire would also ask for information about the office location, phone number and directions on how to get there.  Include a map, a photo of the building, a photo of the agent.  This will include enough information to optimize the agents page for local search. Fields in the questionnaire enable it to draw information that will be used by a program to complete a unique title, meta description and , etc. tags.  The goal of this is to construct an optimized page that will draw local traffic I would not leave it up to the agent to edit this information on the website. Once a year, each agent will be sent to a questionnaire that contains information from last year.  They can edit or approve.  New agents will be asked to complete a new form or edit the form of the person who they replace. Finally, I would not place these on subdomains.  They would be organized in folders.  Then you can draw information from all of the questionnairs to construct category pages for major geographic areas such as states or major cities. Done right, these questionnaire can be used to produce agent pages and many other pages that will compete in local, regional and other categories of search.

this is the way I understood it - if you can add the canonical url to each page it is ok. If you can't add the canonical you shouldn't mask the url as you will be creating duplicate content as each page is accessible on 2 urls, the subdomain and your personal domain