Maintenance Page during deployment in IIS

Hi Team,

Is there a way to display the Maintenance page for specific web site during IIS deployment and back to normal status once deployment completed.

Please note I already tried it by placing the app_offline.htm in application root folder. And its working fine, but its not working where application pool .NET CLR version is No Managed Code.

And also is there a way , so that I can place the app_offline.htm file in root folder and it should reflect for all the application inside the root folder.

Or else do we have any other approach like redirecting to different static URL for all the website during deployment and change it to normal once deployment is completed.