You can specify a maximum of 20 origin IP addresses in a website configuration.
When multiple origin IP addresses are specified, WAF performs load balance across them when returning the inspected web traffic. WAF also performs health check on all origin IPs. When one IP is inaccessible, WAF stops assigning requests to that IP until it can be accessed again.
Suppose you have three origin IPs: 18.104.22.168, 22.214.171.124, and 126.96.36.199. You can configure your website as follows.