Using Multi-Domains with WPMU domain mapping

How can I use multi-domains with WPMU domain mapping (http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/). Both plugins have a sunrise file. I would use the mapping plugin that wpmudev offers but my WPMU is hosted a subdomain and I don't think A records work for domain mapping. The publicly available mapping plugin allows users to create CNAME records instead,