Best solution for HA for single application runnung on Server 2019: 2 servers and 2 iscasi targets

I'm looking for possibility to configure HA based on Windows Server 2019 running on bare metal, for one single application. I have 2 physical servers running on bare metal and 2 iscasi storage devices. The application has to run outside of the active directory and it has it's own user authentication.  The application running on MS SQL.