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This is a guide on how to install the latest version of Microsoft Office for free. For this method, we will use the Office Deployment Tool. The Microsoft Office Deployment Tool...
I only found this guide. It supports up to Office 2019 only (no Office 365 or 2021) and I'm not sure if it's the best method, but it's the only thing I found after searching far and wide.
There are volume licenses for Macs floating around - you install a package that contains the serial files, and then install Microsoft Office as normal. The MacSerialJunkie forum will have a more detailed guide