Endpoint Protection Suite Plus - Exchange Shield Settings & Antispam

Should I have “Scan at transport level” turned on?

Any suggestions on the Exchange Shield or AntiSpam that would make my setup more reliable at stopping spam?

Why do I never see anything in “Shield Log”.

https://www.avast.com/download-documentation.

All settings should be as you want them.
It is entirely up to you to change them (or not).