If you have multiple instances of SQL Server, then you need a <ServerName> node that describes each instance. I am not sure the question makes this clear.
If you use FineBuild to install your instances, then this work is done for you automatically.
Also, if you install a SQL cluster and are certain you will only ever have one SQL instance on the cluster it is safe to setup SSIS as a cluster. If you want a SSIS cluster, use the parameter /SetupSSISCluster:Yes
and FineBuild will build the SSIS cluster, setup a Package Store folder on a shared drive, and update MsDtsSrvr.ini to allow SSIS to recognise both the shared msdb database and the shared package store folder.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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Disclaimer: All information provided is a personal opinion that may not match reality.
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