How to validate the security/integrity of RPM packages required for Observium install

Is there a way to verify the security/integrity of the RPM's proposed in the Observium install guide for RHEL.? Perhaps an HASH kind of something.?

This is needed for security audit in our organization where we are using the Enterprise Edition of Observium.

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

yum install http://yum.opennms.org/repofiles/opennms-repo-stable-rhel8.noarch.rpm

yum install http://rpms.remirepo.net/enterprise/remi-release-8.rpm