I would recommend pointing it at the load balancer. Each of the web application nodes will be able to handle the incoming requests.
I noticed that you posted this as a Discussion. I would recommend posting help requests as a Case so that it is entered in for our Support team to take a look at. Support Cases are monitored, but Discussions like these are not. Cases vs Discussions in the Jive Community
Please let me know if you have any questions, or if this does not resolve the issue.
I did do a case, sev 3 - but I wanted to get an aswer ASAP! You get the correct answer points
It just seemed odd that as part the App Marketplace documentation, there's no mention of where to point the DNS subdomain to - just that best practice is to do a single or wildcard DNS entry.