LDAP syncrepl with multiple DITs?

I have two different configurations, both of which work well. One has a single DIT, and does syncrepl multi-master replication. The other has two DITs on a single host. What I would like to do is set up a multiple-DIT configuration with multi-master replication. I have not been able to find any information on how to do so. Does anyone have pointers on where I could find info on doing this setup? Thanks.