I have already set up single instances of SQL in AWS, but now looking to build redundancy for HA/DR. We use EC2 instead of RDS.
SQL clustering is only supported by Enterprise edition, which is way more expensive than Standard. I had checked the pdf you mentioned when we were setting up the system, but it wouldn't apply to Standard edition.
I was not talking about 3rd party storage, but third party clustering/HA setup and management for Standard edition. SQL clustering requires shared storage by different nodes, which is not currently available in AWS. EFS might work, but it's not released yet.