Identity Management Prod Setup

 Hi All,

I wanted to design a production architecture for Identity Mgmt setup using latest 11g middleware with implementation of products OID,OAM,OIM .

I am going through all the available documentation but Can somebody help me in understanding the below:

1)Can I place all the application components  under the same middleware home (OID,SOA,OIM,Weggate,Access Gate) i,e three to four oracle_homes for OH_IDM1 , OH_IDM2, OH_Web, OH_SOA  and configure web logic domains for all of them under the same middleware home . What is the ideal case for a prod configuration

2) Is Installation of Webtier Utilities / Access Gates a mandatory thing for Identity Management Setup