I have no experience with putting a load balancer in front of 2 lisa servers, just some generic thoughts:
Basically, both these lisa VSEs would be unaware that they are part of such an high-availability architecture. So, from LISA point of view there is no configuration needed AFAIK.
Configuration changes are in your SUT and in the setup of the load balancer.
The assumption for such an architecture to work as expected would be that the virtual service VSMs are: