SLD best practices

Hi Mates,

We already have SAP EP and Soln Manager and R/3, CRM etc. We are planning to install XI now.

I understand that a single SLD which is used by EP, XI and Soln manger is the recommended approach. Also, SAP recommends single SLD for DEV, QA and PRD enviroment.

Now my question is where to install & host the SLD? I see the following options

SLD + Soln Manger on same system

SLD + XI on same system

SLD on a diff system altogether

Whats the best practice and what are its pros n cons.

I highly appreciate your views.

Thanks

Praveen