Ezoic is a Cloudflare partner. They are using the Cloudflare services and doing some additional things.
To whitelist the Ezoic IP addresses do the steps below.
Copy the Ezoic IP address CIDR htaccess code from here > https://support.ezoic.com/kb/article/how-to-fix-origin-errors?id=how-to-fix-origin-errors&lang=en-US into the Plugin Firewall > Plugin Firewall Additional Whitelist Tools > Whitelist by Hostname (domain name) and IP Address text box > click the Save Hostname and IP Address Rules button > click the Plugin Firewall Activate button.