Minimum raised bed for espalier trees

I have a very narrow (18 inches), 20 feet long, 2 feet high raised bed that currently has small rose bushes and sages. I’d love to swap a few fruit options in there instead. Is that at all feasible for an espalier situation? Would a more robust root stock that could make it into the underlying ground be better or worse than a dwarf option?

As long as the raised beds are on top of soil, I don’t think you would have any limitations.

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