Common non-screw mounting methods include clamp or clip-on grips that attach to window sills or frames, adjustable snap-in or telescopic support legs, and suction cups designed for glass mounting.
Capacities vary by model: many no-screw perches are rated around 40 pounds (≈18 kg), while smaller models list capacities near 22 pounds. In the examples provided, ratings range roughly from 22 lbs up to 40 lbs.
Snap-in or telescopic leg systems are described for wider sill widths (about 15"–28"). Clip-on/clip designs are intended for thinner sills or frames, roughly 0.5"–1.5" thick.
Most no-screw perches are tool-free: some require no assembly, others need simple adult assembly without tools, and several advertise no-drill, quick installations using clamps, suction, or snap-in legs.
No-screw perches can be used on sunny windows, radiators, bookshelves, dressers or cabinets, bedside tables, and desks. Some models also include rubber-tipped legs for freestanding placement on furniture or floors.
Some perches are labeled for all sizes, while others use size categories such as Small (0–25 lbs), Medium (26–50 lbs), and Large (51–75 lbs), so options span from small to large cats.