If you're buying dozens of Office keys, then a site license for Windows and Office makes a lot more sense.
And those licenses are managed between you and MS. Then it's a simple count of Office installations and you know how many licenses you should be using. You typically do an annual license "true up" with MS.
Or Office 365. Yeah, I know people hate SaaS, but businesses love it. Licensing is flexible and scales up and down as you need it. And you get major updates as long as you have a license, unlike when you buy 2021 Pro Plus or whatever, where you'll always be on 2021.
That's what we're using now and where quite some problems come from. I don't have anything against it, it's awesome suite for personal use, but running it in company we constantly run into problems with compatibility. Every partner we're dealing with is using MS Office and when they're exchanging spreadsheets or documents with us it's often pain in the a*s to make it work. And MS is not helping in this...
If you clearly define your needs, it won't be hard to figure out which version you'll want. Then you don't really have to manage those office installations as long as you have enough licenses in the pool.
That's just the tip of the iceberg, you'll likely want to have something to centrally manage these computers, so something like Intune + EntraID to deploy softwares, manage the user account, etc will be an added cost.