ACL for sync reader

Hello, I have a production ldap with some acl set. For historical reason the synchronizationn is done with the root dn which is bad. I want to add a user to perform synchronization it must have the right to read everytthing. is the acl : access to * by dn.exact=<somedn> break added in first position be enough to read everything (even attributs that have been limited on some other acl) AND not break the current configuration ? Thanks in advance. f.g.