info required to setup office volume licensing activation server

Hello, I came here to gather some info about stuff i don't understand from microsoft own toutorials about how to setup and use ksm activation servers on your local network.

I work in small Polish highschool
we own 2 open licences for ms office
1 40 licences for office 2013 pro plus
2 60 licences for office 2019 standard

i have mak keys for both but since activation limit is set to 100 on each of them i rather use in house ksm server to activate office internaly and to count our activated copies on our own, because in school broken computer is a common thing and fixing it to save activated by mak key copy of office isn't always possible or time effective and the limit run out fast.

I have prepared one windows 10 pro pc to work as a msql server, so i might as well use it for licencing server since it would run all the time anyway

And here are stuff i don't get
microsoft wrote on their article about installing ksm server that you need volume licencing windows version too for it to work. but i was also told that licencing of windows have no bearing on office licencing , so i am confused.
Our network is a big workgroup setup without dedicated serves or active directory, and all windows licences came from oem of the computers. Would that have any downsides ?
I also heard that there is a minimal number of clients before ksm server start working at all, we have 30 computers for office 2019 in one building and another 15 in a building next door
for 2013 pro we have 16+ computers at the moment, but i may as well upgrade all the teachers computers so 20-30 clients is also an option.

i would be glad if someone would clear things out once and for all for me , because i am a networking person and hardware wizard, but often fail to understand how microsoft programs work.
thanks for any help in advance

That size of a network needs a Domain to see the Forest through the Trees so to speak.

can you explain what you mean?
I don't understand the basics of how it suposed to work in domain or workgroup. So first you could explain what conditions it has to have to work in a workgroup and what would rule it out and make it domain exclusive or something.

And we do not have a domain or domain controller , we might make fake dc from a linux running samba4 but that is the most i can do at the moment

I want to gather information of minimal hardware requirements for it to work. So i can work around it, and make or buy stuff for the school required for kms activation to function. doesn't need to look or work pretty, just need to function when it is needed.