MainWP is a well-known way to manage multiple WordPress websites. Security Ninja integrates with MainWP via an extension you install on your MainWP Dashboard. Child sites need Security Ninja itself, not the MainWP addon.
Start here for a full premium setup (license, child sites, and sync):
More guides:
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Get started with MainWP
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Install the free MainWP extension
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How to access Security Ninja in MainWP Dashboard
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How to Show/Hide the column
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Bulk Actions in MainWP
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Copy settings from MainWP
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Manage IPs from MainWP
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The Global Event Log
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How to Control White Label Settings Remotely
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Using Security Ninja tokens in MainWP Pro Reports
Release notes for the extension: Security Ninja for MainWP changelog.