SAP GRC Installation

Dears,

We are planning to install GRC.Beinf new to GRC I have some doubts for it.

1- When searching for installation guide I found several components Like Access Control,Risk Managament..

We want to install all these component so I want to know do I need to install all these components sepratley on server or they can be install on a server and these components are independent of each other or do i need to install a common platform and on that i can install all required componenets.

2-I have searched a lot but not found any sizing guide for it,So please what should be hardware configuration for it.

Please Suggest.

Shivam