Newbie here. CNAME vs Alias

I have a Domain say "www.example.com" which is hosted on Salesforce. I have a CNAME (www) record that points "www.example.com" to Salesforce Host Server. I do not have a IP address, so no 'A' Record. So far, it all works fine. The problem is "example.com" (naked domain) is a dead end for users. I was wondering that I could use Alias record that points "example.com" to "www.example.com". So to say both "example.com" and "www.example.com" both should point to the same Salesforce Host Server. But I see a note that got me confused.

URL: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html Paragraph: Unlike a CNAME record, you can create an alias record at the top node of a DNS namespace, also known as the zone apex. For example, if you register the DNS name example.com, the zone apex is example.com. You can't create a CNAME record for example.com, but you can create an alias record for example.com that routes traffic to www.example.com (as long as www.example.com doesn't already have a CNAME record).

My confusion - "(as long as www.example.com doesn't already have a CNAME record)" got me offtrack. CNAME record for www.example.com has to exist, right? Along with CNAME if I also create a ALIAS record will that not solve my problem?