eXo User profiles also have entries in the ldap but the actual storage is still done with the hibernate service. You will need the following parameters:
<field name="profileURL"><string>ou=profiles,ou=portal,dc=exoplatform,dc=org</string></field>
<field name="profileLDAPClasses"><string>top,organizationalPerson</string></field>
profileURL: base dn to store user profiles
profileLDAPClasses: Classes used to when creating user profiles