How to load EHP1 for SAP EWM 7.0 Add-On Installation in existing ECC 6.0 EHP5

Hi Experts

I have to activate EWM 7.0 Add-on in existing ECC 6.0 EHP5 system. What is the procedure.

Can we add EWM in existing ECC 6.0 EHP5? or we have to install EWM 7.0 as separate solution and then integrate ECC 6.0 and SCM 7.0. As per my knowledge EWM is a component of SCM 7.0. Please correct me if I am wrong.

What way is best to proceed with the job.