There is nothing special at all about using SCCM to deploy the PolicyPak CSE. It will honor a silent install and will not require or request a reboot.
Examples of typical silent command lines to run are below:
msiexec /i “C:\Temp\PolicyPak Client-Side Extension x64.msi” /qnmsiexec /i “C:\Temp\PolicyPak Client-Side Extension x64.msi” /qn /norestartMore info on MSIEXEC command line switches can be found here:
https://docs.microsoft.com/en-us/windows/win32/msi/standard-installer-command-line-options
The only caveats are around PolicyPak Browser Router: