Installing applications in factory mode

I am trying to install an application (MSI) in the factory mode of
Sysprep. I am using 'Attach' for the 'InstallType'.

1. I am not sure whether I should be using Attach at all as I simply
want to install the application (not to stage it or to attach
previously staged application) but it seems the best choice to me.

2. Whenever I put anything in the 'CmdLine' entry the installation
fails with exit code 1639 which should be 'Invalid command line
argument'. I tried simple /q and -q and it won't work. If I omit
'CmdLine' entry application installs fine.

Here is how part of my Winbom.ini looks like:

[OEMRunOnce]
"Adobe Reader", "AdobeReader", MSI

[AdobeReader]
InstallType = Attach
StagePath = "\\servername\sharename\Apps\Adobe Reader"
SetupFile = AcroRead.msi
CmdLine = /q
RemoveStagePath = No