Hi Omar, you should choose "No, do not configure high availability across Availability Zones" from the field above and then you will not enter any EIP. I know this sounds counter-intuitive, but that field is assuming you will use EIP's. In this architecture discussed, we are not using EIP's.
Also - at this point you should really be using the Cloud Failover Extension (CFE) which was released about a year ago, and is mentioned in an update to the article above. The CFE allows you to declare a failover configuration as a JSON template, and that iApp is no longer the way to do it going forward into the future.
Feel free to email me or reach out directly if you need help.