Freestanding racks fail in ways mounted fixtures never do, because a floor standing clothing rack has to fight gravity all by itself — no wall, no ceiling, just its base and its manners. Most of what I know about this came from site visits where something had already gone wrong. Learn from other people's toppled racks, not your own.
The base is the product; the rail is the accessory
Stability comes from three things: base weight, base spread, and where the load sits. A T-base or X-base with 10 kg+ of steel in the feet resists a customer's casual pull; a lightweight base relies on hope. Spread matters as much as weight — feet that extend 60 cm or more along the rail axis counterbalance hanging loads far better than compact bases that look tidier. And a rail loaded heavily at one end converts the whole rack into a lever. Load evenly, or buy a heavier base than the brochure suggests.
Footprint: the number stores underestimate
The footprint isn't the base outline — it's the base plus the human space to actually browse it. A straight rack with a 60 cm base needs 1 m of clearance in front for a customer and their bag to stand without blocking the aisle. I've measured small stores where racks technically "fit" with 30 cm to spare, then watched customers skip the entire section because approaching it felt like squeezing past furniture. The rack fits; the store doesn't. Plan the breathing room first.

Leveling feet or casters — decide what the rack's job is
Racks that stay put all season should have adjustable leveling feet; they don't wander, and they take uneven floors without wobble. Rolling versions earn their casters in stockrooms, event spaces and stores that re-merchandise weekly — but then at least two locking casters are non-negotiable, and floor surface matters: soft PU wheels on hard floors, never rigid PP, unless you enjoy the sound of complaints. A rolling rack with no brakes is not a fixture; it's a liability wearing a fixture's clothes.
The mistakes I keep seeing on site
Top three, in order of frequency: overloading one end (the lever problem above), placing racks against HVAC vents where temperature swings loosen set screws over seasons, and using lightweight domestic racks in commercial traffic. Domestic-grade freestanding racks cost half as much and last a quarter as long in a store — the math only looks wrong until you've replaced them twice.
A floor standing clothing rack is the most exposed fixture you own. Everyone sees it, everyone touches it, and nothing anchors it but its own design. Buy it like it has to survive a crowd — because on Saturdays, it does.