They are not very good compartmentalizers in my experience. I would put a rod above, and two through the inclusion perpendicular to each other. I like using the Drayer Tree Guard that WesSpur carries for cabling scenarios like that. I don’t usually like to just blurt out how I would do it, but...
I know there is at least one species that doesn’t spread so voraciously like the others and is actually easy to manage.
Flowering pears are just terrible. An appropriate ban. The only pruning they should get is the one cut prune.