Install to use the major level release repositories.

I am trying to get a clearer understanding of how to use the content from the Major level release repo for provisioning & updates.
Based on :https://access.redhat.com/articles/1586183
My understanding is that :
- The major release repo will provide updates through the all the minor release
- One is not supposed to mix Xserver with X.y content
- 8.0 is not the same as 8server

(excluding AppStream & Supplementary for brevity)
Looking at the repositories, focusing on BaseOS I find:
Red Hat Enterprise Linux 8 for x86_64 - BaseOS ISOs 8
Red Hat Enterprise Linux 8 for x86_64 - BaseOS ISOs 8.0
Red Hat Enterprise Linux 8 for x86_64 - BaseOS ISOs 8.1
Red Hat Enterprise Linux 8 for x86_64 - BaseOS ISOs 8.2
Red Hat Enterprise Linux 8 for x86_64 - BaseOS ISOs 8.3
Red Hat Enterprise Linux 8 for x86_64 - BaseOS Kickstart 8.0
Red Hat Enterprise Linux 8 for x86_64 - BaseOS Kickstart 8.
Red Hat Enterprise Linux 8 for x86_64 - BaseOS Kickstart 8.3
Red Hat Enterprise Linux 8 for x86_64 - BaseOS RPMs 8
Red Hat Enterprise Linux 8 for x86_64 - BaseOS RPMs 8.2
Red Hat Enterprise Linux 8 for x86_64 - BaseOS RPMs 8.3

Inspecting the ISOs repositories I am only able to see 8.x enumerated, but nothing for 8 / 8server.
For example: I can use the rhel-8.3-x86_64-dvd.iso to create an install that would use the BaseOS RPMs 8.3

So what is the preferred method installing a host that would use the BaseOS RPMs 8?
Is this a post install operation (with subscription-manager), is there a specific software selection, or by some other method such as discovery / provisioning?