Not familiar with Altiris Deployment Console, but here's the argument string I've been passing to notes901fp2_win.exe for silent installs:
-s -a /s /v"/LV* <WindowsInstallerLogPath> /QN"
This update is installed after Notes 9.0.1 Social Edition by a wrapper script. With regard to administrator rights—unless you're deploying to Windows XP or have configured Notes to avoid protected folders, I think you'll need those elevated privileges.