Espalier x3 citrus between on set of posts???

Anyone tried this in their urban to contribute to their food garden?

Citrus choices
Lemonade lemon _ eating raw
Thin skinned lemon _ juicing /cooking
Mandarin _ eating raw

They all need space and evergreens will cast ""shade""" which in an urban space is essential to manage.

Have i come up with a perfect plan?
Espalier all three between one set of posts with the wires for support but space their trucks side by side with space to fatten over the years.

Therefore one large hole with three root systems becoming one over time, and one visual espaliered screening against the western side of a typical timber urban boundry fence between neighbours. With that fence being on the eastern side of the garden border so they will not cast afternoon sun on vege beds and along the fence because my possums dont eat citrus. But may try mandatin except it might be camoflaged with the lemons.

Length of espalier = maybe 2.5meters (× 3 for feet).
Hright= wires shorter than 2meters but growth up to 2m.

Im imagining repurposing red gum/hardwood fence posts for a few years to get all braches are well established.
Then eventually the Red gum can be reused for slow long fire pit nights eventually.

Or may go steel postsx2 plus tension kit for horizontal wires.

Any similar attempts ?
Success?
Failures?
Tips?
Cautions?
etc

Citrus is out of my zone but the concept looks good.  My preference is for the steel posts because I constantly repurpose them on the homestead. Instead of wire I use plastic hay twine because if it gets incorporated into the wood of the tree it does not cause damage to pruning tools. Tensioning can be accomplished with a diagonal line to a stake in the ground or the fence at each end.  I am doing berry vines and if it gets to difficult to remove old vines I can cut the twine and it burns up with the dead vines.