Sailboat cup holders: gimbal, mount or base?
A portable base does not replace attachment.

Mounted marine holders
Marine holders can use specific mounting systems. Check their installation and vessel compatibility; the categories are not interchangeable.
Gimballed designs
A gimballed holder is designed around movement at its mounting point. Steadi has no gimbal mechanism and should not be described as equivalent.
A table at a calm stop
Steadi grips the compatible container and widens its resting footprint. It does not attach to the table or seal the drink.