Hello. Setting up the load balancer is outside the Cognos software, so the team managing that device or software will be able to create it.
The only general recommendation is to ensure "sticky" session is enabled per the following document: https://www.ibm.com/support/pages/f5-load-balancer-persistence-type-cognos-bi
On a side note, your app servers probably also have the content manager component so they will also connect to the SQL instance for your content store.
------------------------------
Luke Peterson
Business Analytics Advocate
IBM
------------------------------