If you don't have an office (or can't create an office) in common area, you should not (repeat
NOT) have this system in your personal unit. It opens up way too many potential issues for you personally.
Additionally, prior to installing any system, the Board needs to adopt a policy about the recordings (as the recordings become part of the Association records and open for review by members). Things to have in the policy:
Who has access
how members can review
how long recordings will be kept
how requests from outside agencies (police, fire, legal) will be handled
Is the system monitored or not
Who monitors
how is monitoring tracked
Also, check to see if your allowed to record audio in your State (as it varies by State).
You may need to prevent any audio recording capability in your system if the State requires you to be part of the conversation.
Some reference material:
Surveillance Cameras within your AssociationThe potential benefits of HOA surveillance cameras and guidelines for their use from a law firm
Condo Surveillance and the Law from a new england law firm
3 Things to Include in Your HOA's Onsite-Camera Policy from HOA leader
Rulesand Regulations Governing Surveillance Camera Data and Use Within [NAME]Condominium