buddypress install location with multisite

Hey all. I am creating a site for a chamber of commerce. I want to allow members to create their own sites for their businesses which is fine, I can do this with multisite. However, I also want them to be able to interact with buddypress, but I don't want buddypress to be part of my main site. So my question is: Should I install buddypress in the main directory so it is available across the site OR should I allow users to create individual sites with the main site and then install buddypress in a subdirectory like http://www.example.com/community where they can interact from there. OR on second though, do I create an entirely new site for the community group and keep the chamber site separate. Sorry if this is extremely convoluted. I'm hoping someone has some insight. Thanks in advance!