Hi Gaurang,
You need minimum
SharePoint Online Plan 2 subscription if you are just using SharePoint from O365 landscape
If you are all 6 are going to Read/ Write then you need 6 SharePoint Online Plan 2 subscriptions. If you are planning to use Office applications or communication
tools like skype/Hi Teams then you need to go with Enterprise E3.
Have a quick look: https://products.office.com/en-us/sharepoint/compare-sharepoint-plans
Hope this helps!
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