Why a spa-side drink needs more than a wider base
Curved ledges, moisture and moving covers change the setup.

A sloped rim is still sloped
A wider base cannot level a molded tub edge. A base partly supported by a recess can also rock. Use the whole footprint on a level stationary surface, and move the drink whenever the spot would require balancing it.
Do not rely on wet-surface grip
Water, sunscreen and cleaning products can change how surfaces behave. No wet-grip or chemical-resistance guarantee is made for Steadi. Use a suitable clean dry resting spot and follow the spa and furniture care instructions. Hand wash the holder rather than treating it as a permanent outdoor fixture.
Keep steps and moving parts free
Move the drink before opening a cover or changing the nearby furniture. Keep it out of access paths. A lidded container may suit the setting, but Steadi adds no liquid seal. These placement limits matter even when the container’s diameter fits correctly.