How deep do the posts go?

Deep enough for the panel height and for the ground it is going into. That is a calculation, not a habit.

Do I need a pedestrian gate in the run?

One somewhere sensible is the thing nobody regrets and plenty of people come back to add later.

There is no room for a gate to swing.

Then it should not swing. A slide or a cantilever gets the same opening without needing an arc that is not there.

Will it overhang the sidewalk?

It should not, and that is a design constraint rather than a preference — whatever the gate does happens inside the property line.

Aluminum & Steel Fencing in Miami Springs, FL

Black slat gate set into a wall of climbing greenery at a modern entrance

Aluminum or steel · Miami Springs, FL

One will not rust. The other takes ornamental work. The site usually decides.

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Black sliding gate running along a concrete driveway beside a clipped lawn and palms. — The urban core — Where the driveway usually meets the sidewalk and the swing arc has to come from somewhere else.

Miami Springs · Miami-Dade County

Aluminum is the low-maintenance answer for long runs and exposed boundaries. Steel is what you want when the fence has real ornamental detail in it. Neither is the right answer everywhere, which is why the site gets looked at first.

City boundaries are short runs with a lot of returns. The corners and the step-downs are where a fence line either looks considered or looks improvised.

Where the property line meets a public sidewalk, everything the gate does has to happen inside the property.

Wind load first, paperwork second

The High-Velocity Hurricane Zone covers Miami-Dade in full, which is what decides the frame and the fixings long before anyone picks a finish. Approval is a separate, local question: in Miami Springs it runs through whichever authority has jurisdiction, and where a homeowners' association governs the street its architectural review usually runs alongside it.

Fencing — the full breakdown

Fencing · Miami Springs

05 frames

Horizontal slat gate and fence at the side of a modern rendered house

Slat, side return

Ornamental iron fence running behind a clipped hedge under a line of palms — Iron behind hedge

Timber-look horizontal slat fence running along a path with planting behind — Horizontal timber-look

Close view of cast spear-top finials on a black ornamental iron fence — Spear-top finials

Black horizontal louvre slats silhouetted against water at sunset — Louvre, backlit

Straight answers

Set to the grade
Matched to the gate
Aluminum or steel
Ornamental estate
Slide & cantilever options

How deep do the posts go?: Deep enough for the panel height and for the ground it is going into. That is a calculation, not a habit.
Do I need a pedestrian gate in the run?: One somewhere sensible is the thing nobody regrets and plenty of people come back to add later.
There is no room for a gate to swing.: Then it should not swing. A slide or a cantilever gets the same opening without needing an arc that is not there.
Will it overhang the sidewalk?: It should not, and that is a design constraint rather than a preference — whatever the gate does happens inside the property line.

Also covered

The towns marked The urban core share the same geography as Miami Springs.