This project builds an RPM from source for HAProxy 1.6.x, installing it as a systemd service and sending logs to the systemd journal (by default).
Building it in docker is easy:
make
You can try and build a different version by providing it as an argument to the builder.
make VERSION=1.6.5 RELEASE=2
If you're in a hurry and willing to trust some guy on github, you can download a package here.