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load balancing for infra node in HA setup

The docs for installing a high availability openshift cluster e.g. [1] are fairly clear when it comes to the master node. If you set up a 3 masters then you need a load balancer that sits in front of these. OpenShift can provide this or you can provide your own external one.

What not so clear is how to handle the nodes where the infrastructure components (registry and router) get deployed. In a typical example you would have 2 of these nodes, but what would happen in this case?

Does a single registry and router get deployed to one of those nodes (in which case it would be difficult to set up DNS for the router to point to the right one).

Or does the router get deployed to both so a load balancer is needed in front of these?

And similarly for the registry. Is there one or two of these deployed? How does this work?

I hope someone can clarify this.

[1] https://docs.openshift.org/latest/install_config/install/advanced_install.html#multiple-masters

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