Deploying  IIS 7 Manager is pretty simple. 

You need to enable a feature IIS Management Console before installing the software. In order to enable the feature for this three command lines are to be run so that the feature.

Command Lines:

dism.exe /online /Enable-Feature /FeatureName:IIS-WebServerRole

dism.exe /online /Enable-Feature /FeatureName:IIS-WebServerManagementTools

dism.exe /online /Enable-Feature /FeatureName:IIS-ManagementConsole

Note:

 These should run in the same order as shown. If not the features would not be enabled.

And then run the MSI. That should take of it.

I would normally prefer a dotNet Bootstrapper to install this. As it would run them in an order.