In case anyone else is looking for this like I was:
First, if necessary, extract the installers and prerequisites needed to a path of your choice:
Setup.exe /layout
You'll notice there's a .\Redist subfolder created as well as the usual installer, which contains the prerequisites. You need these to "travel with" the setup.exe when deploying...
Once you have your files in order, to silently install just the client:
\Setup.exe /install ALLUSERS=1 InstallType=3 /quiet norestart
Hope this helps!