They are offered as freestanding units, pressure-mounted models, and hardware-mounted gates. Some products support both pressure- and hardware-mounting.
The listings show products made from plastic or metal, and some gates combine metal and plastic components.
Top-of-stairs gates are typically taller (about 30–38 inches) and often include stair-specific safety features such as door stoppers to prevent the gate from swinging over the stair edge.
Play yards are freestanding and often foldable for portability, with some listings noting a carry strap. Safety gates typically require assembly and install with pressure- or hardware-mounting (tools sometimes required); some retractable or pressure-mounted gates advertise minimal or no assembly.