I have installed HA as instructed in the articles below
https://support.solarwinds.com/SuccessCenter/s/article/How-to-set-up-High-Availability-for-the-Orion-Platform-Video?language=en_US
https://documentation.solarwinds.com/en/Success_Center/orionplatform/Content/HA_what_is_VIP.htm
What I am unsure of however is whether or not the VIP has to be added to network cards as a secondary IP?
It is not necessary to manually add the VIP to the NICs I.P configuration, HA will do this as part of the setup and during the failover process.