Deploy Updates and Security Fixes to Disconnected RHEL 6.7 Servers?

I have multiple environments that are not internet connected and contain RHEL 6.7 servers.
I need to be able to provide updates and security fixes to these servers on a regular basis.

We don't have Satellite and there are no plans to deploy it.
From the research I've done, it appears that my next best option is a YUM Repo server?
I have found two different methods of achieving this from searching the RedHat site.

https://access.redhat.com/solutions/45956
and
https://access.redhat.com/solutions/23016

One method utilizes 'reposync' while the other uses a combination of:
yumdownloader --resolve

rpm -qa

Which method should I use?
45956 or 23016?

I also need to install Security updates on these systems.
How should I do this?
I found this on the RedHat site.
https://access.redhat.com/solutions/55654
Do I need to implement this?

Thanks!