Jason, thanks for the help! I got Suricata installed and downloaded its dependencies. For anyone interested, the steps I followed on RHEL 7.6 were:
cd /etc/yum.repos.d
curl -OL https://copr.fedorainfracloud.org/coprs/g/oisf/suricata-6.0/repo/epel-7/group_oisf-suricata-6.0-epel-7.repo
cd
mkdir -p suricata suricata/rpms
cd suricata
sudo yumdownloader --resolve --destdir=rpms suricata
cd $HOME/suricata/rpms
sudo yum --disablerepo=* localinstall *.rpm
These were the RPMs I got:
hiredis-0.12.1-2.el7.x86_64.rpm libnet-1.1.6-7.el7.x86_64.rpm python2-pyyaml-3.10-0.el7.noarch.rpm
libmaxminddb-1.2.0-6.el7.x86_64.rpm libnetfilter_queue-1.0.2-2.el7_2.x86_64.rpm suricata-6.0.2-1.el7.x86_64.rpm