Hi @SamT
As you seem to be small office and wish less expensive option + your major products are MS Products - You can explore -- Azure Security Center (Most economical) -- -Works for both on Prem and Cloud
This should be suitable for your environment. https://azure.microsoft.com/en-gb/pricing/details/security-center/
Other Options (but adding some more IT OPEX)
- watchguard
- f5 Secure Web Gw
- Zscaler
- Sophos (expensive)
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Regards,
J.D.
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