all these services like sucuri, cloudflare etc
wont help you with malware or hackers... this is just a marketing
i have tested heavily sucuri firewall and cloudflare and others too, their services are pretty stupid and really just add some overhead.
sucuri failed in 3 from 3 magento shops with malware was already injected and injected after configuration, this sucks.
cloudflare just disables your local firewall because of a DNS, so you have to write your scripts or use known plugins to re-enter all bad ips detected on the server back to cloudflare firewall, also there were some many errors on cloudflare.
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