Recently I saw two large boxed specimens in a nursery that were supposed to be 'Gulftide'. These were more narrow than would be expected from typical O. heterophyllus of the same height. But we are still not talking about a columnar or fastigiate plant, nor a small one - these were already plenty big enough to overwhelm the entrance to a one-story house.

And you don't want an interchangeable pair at the front door anyway, unless the house has a geometrically symmetric facade - and the garden scene in front of the house also displays use of the same style throughout. Otherwise the formality of the entryway does not match the informality of the rest, in the fashion of a tuxedo at a picnic.

2. SKIP THE FORMALITY

Not all formal effects create work; crisp areas of paving, simple water features, decorative walls, sheets of neat groundcovers are about as carefree as anything. But tightly sheared hedges, topiary shrubs, long soldier courses of identically shaped trees demand regular attention. Also, when any of your matching plant sculptures dies, it may be impossible to replace. A garden in a softer, more natural style will forgive lapses in maintenance