Create directory $HOME/dropbox. Inside create directory for each Dropbox account you want to sync.
Create below file for each Dropbox account, paths pointing to each Dropbox account directory you created above.

  cd "$HOME/dropbox/yr"
  HOME="$HOME/dropbox/yr" && /home/$USER/.dropbox-dist/dropboxd &   

Make files executable and place somewhere in your path ($HOME/bin/).
Run files one by one. Each time a browser will popup asking you to link to a Dropbox account.
Once all accounts linked respectively Dropbox will start syncing local and cloud directories accordingly.

To stop Dropbox for specific account find out PID of the dropbox daemon associated with the account:

  for i in $(ps aux|grep "dropbox-dist"|grep -v 'grep'|tr -s ' ' | cut -d' ' -f2); do pwdx $i; done
  4619: /home/mumrik/dropbox/yr
  4678: /home/mumrik/dropbox/ge

You can now use kill PID to stop the account you want.