Spa-side table, clip-on tray or freestanding holder?
Match the accessory to the tub and the job.
Clips and trays need a compatible tub
A tub-wall attachment must match the construction it is designed for. Do not treat a fit chart for an inflatable wall as permission to use the product on an acrylic shell, or vice versa. Check the exact accessory’s instructions, clearance and support rather than selecting on photographs alone.
Floating holders are a separate choice
A floating drink accessory is designed for use in water. Steadi is a freestanding surface holder, and no flotation use is claimed. Keep it on an appropriate resting surface. The fact that the material can be hand washed does not establish spa-chemical resistance or flotation performance.
Choose the simplest appropriate surface
Where a broad stable table already exists, Steadi adds a wider base to a compatible cup without installation. Hot Spring lists spa-side enhancements as a separate accessory category; check your own spa maker for equipment fit. Choose the surface first, then decide whether a holder adds something useful.