Apple School Manager is the best and easiest way to organise numerous Apple devices and to setup managed Apple accounts to use with them.
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https://support.apple.com/en-gb/guide/apple-school-manager/axm402206497/web If you purchase a number of Apple devices at a time most companies can add the purchased devices to the Device Enrolment Programme linked to your ASM allowing you to allocate the device to be managed with an MDM.
JAMF would be my preferred MDM over LightSpeed and Meraki but they all do the same thing. Mosyle is a notable free MDM also worth a look (more advanced features need a payment but AppleTVs are free to manage).
All are time consuming to learn and setup but once understood and setup as required needs much less time than working separately with individual devices especially if more devices are added overtime.
Managed accounts allow you to reset passwords and give 200GB of iCloud storage to your users so much better than staff making their own personal accounts.