...and does the decision on what initiatives you follow differ depending on whether you are running a corporate (Enterprise) data center or a co-location (hosting) data center?
OpenDCME can be implemented in an enterprise and a co-location data center. If you are a co-location data center, then invite your customers and their customers to assess the total chain of data center and IT against the OpenDCME model. And in case you use a co-location data center to house your IT, take responsibility of your choice for that data center and embed their KPI scores in your score.