The installation of PowerPivot for SharePoint can be a little complex at times - especially the PowerPivot for SharePoint multi-server farm scenario. In order to help with this, the Analysis Services team and the SQLCAT team came together and created four PowerPivot for SharePoint Installation Guides for your review.
These are DRAFT guides that you can review and provide feedback on. Meanwhile, happy installing!
For more information, please go to PowerPivot Server Installation.