Answer: Podocarpus gracilior is often used in traffic islands and buffer strips in parking lots because the roots tend not to cause problems with sidewalks or blacktop. I suspect they will be just as well-behaved in your landscape. These plants are often espalliered, as well, so consistent pruning won't hurt them at all. I'd leave them alone. I think they'll continue to do well for you for many years to come.
Glad you like Monrovia stock! I'm sure you'll find lots of new introductions that you'll just love. Enjoy!
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