Using IdM UI on NW SSO JAVA Instance

Hello,

I am planning the installation of the following products:

SAP NetWeaver Identity Management 7.2

SAP NetWeaver Single Sign On 1.0

I know that NW SSO 1.0 will need a NW JAVA, so this installation is already planned. I also know that the IdM UI component need one as well...

My question is quite simple: is it truly needed to install an additional NW JAVA instance just for the IdM UI, or I can install the UI component in the same NW JAVA as the NW SSO?

All the other IdM components (DB/MC/RT) would stay on a dedicated server. I just think that installing an NW JAVA just for an UI seems kinda wasteful... particularly because the PRD instances will need to have High Availability.

What do you guys think about that?

Franco