Install msi and exe silent from network folder

Question

I am trying to have a script that will install exe and msi files in silent mode, but it's opening the installers instead of running silently.

#network drive path
$nwDrivePath = "\\server\folder\"                                                  #"

#check if path is valid
if (test-path $nwDrivePath){
    Set-Location $nwDrivePath
}
else{
    #if path is not valid abort
    Write-Output "No path found for $nwDrivePath"
    Write-Output "Aborting script"
    break script
}

#install .exe files
    $allFiles = Get-ChildItem $nwDrivePath -Filter *.exe | ForEach {
    Start-Process $_.Fullname -ArgumentList "/s"
    }

#install .msi files
    $allFiles = Get-ChildItem $nwDrivePath -Filter *.msi | ForEach {
    Start-Process $_.Fullname -ArgumentList "/qn"
    }