Load balancing or reserving

I would like to use Crossbar.io + Autobanh|Python for distributing real-time messages, but I’m not sure how to make the solution stablest as it can. Is there any option for load balancing or at least reserving? Can I place the Crossbar.io behind the balancing proxy, so for example if one of instance will be shutted down the other instance will serve the clients?
I found few simular questions on the forum, but all of them are pretty old, so maybe there are some news for this feature?