Configuring the PA addon on heavy forwarders

[Wildcrd]

I am in a situation where Im re-engineering alot of our splunk instance (splunk cloud)
We have the PA addon on our Heavy forwarder but it was never configured. We also have it on our SH again not configured.
So, Since the logs are currently going through our heavy forwarder via a syslog (universal forwarder) do I configure the Addon on (account, log lvl etc.) on Just the heavy forwarder or do I need to duplicate that config in the addon on our search head?

Note only the app is installed on both our regular splunk SH and our ES search head.