Update Airwatch on premise Server to 9.1.1

Hello, for a customer in Germany i am Searching for an certified airwatch expert, who can update the Server as well as several Secure Mail gateways. - have a meeting with the Customer to observe if all necessary requirements for the update are fulfilled. Get a clear picture if backups etc. for a potential rollback are available - update the server on a Saturday (out of standard office work hours) The work needs to be done on the customers side!! no option for remote work.