You will be using Areca drivers for that controller so they would the ones to tell if TRIM is supported. This is a relatively new card launched only last year and the documentation does mention SSDs. However, I could not find explicit support for TRIM. If they state TRIM support, then your drives will recieve TRIM when used as seperate disks.
Thanks, I checked with Areca and their raid controllers don't support trim . Now I need research which card will lol.