There is not separate public documentation for single-tenant vs multi-tenant FlexNet Manager Suite deployments.
Documentation for FlexNet Manager Suite can be found here: https://docs.flexera.com/?product=FlexNet%20Manager%20Suite%20On%20Premises
For additional documentation needs for any aspects that are specific to a multi-tenant setup being used by a Flexera partner hosting a managed multi-tenant environment, the Flexera account team you have engaged to assist with the deployment may be able to help. That documentation is not published publicly.
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