In typed remote deploy is not supported at all. This means that a child actor will always be local, so the pool routees, which are spawned as children to the pool router actor are also local. As you were guessing for distribution across nodes you will have to use a group router.
With the group router you can then start any number of routees on the nodes, register them to the local receptionist using the service key which will make the group router know of them.