Visio also works as an add-in inside Excel, so if you have a list of staff in a spreadsheet, you can turn that into an org chart, which you can then open in the full Visio web app to work on with ...

Visio in Microsoft 365 is a superb tool for creating custom diagrams to illustrate concepts that are difficult to explain through text. Here’s how to use it.

Additionally, Visio integrates with the Microsoft 365 suite, allowing users to embed diagrams into PowerPoint, Word, or Teams, and store files on OneDrive or SharePoint for easy sharing.

It would be worthwhile to label your rack in the same manner. My Visio rack diagram contains a sample 34U rack with objects from the custom stencil, as well as some Visio default items.