Quick One-liner to look for any VM in your entire vcenter that has the VMware tools installer mounted.
get-view -viewtype virtualmachine -property ‘name’ -Filter @{‘Runtime.ToolsInstallerMounted’=’True’}
#Here is the same command but with the additional text to unmount the installer if any are found.
get-view -viewtype virtualmachine -property ‘name’ -Filter @{‘Runtime.ToolsInstallerMounted’=’True’} | foreach{$_.UnmountToolsInstaller()}