EHS S4 Hana 1511 Integration capabilities

Hi

What are the integration capabilities on S4 Hana 1511 with SAP EHS Central Repository.

If there is a separate SAP EHS central repository which interfaces with multiple Logistics system and S4 Hana 1511 will be used as a primary ERP for all those Logistics system in future.

Which is the better way to go ahead to implement Product Safety and Dangerous Goods?

Implement EHS on S4 Hana 1511 by transferring the processes from EHS box?

or

Interface Central EHS box with S4 Hana 1511?

Thanks

Kalyan