The phrase "a stable surface" is correct and usable in written English.
You can use it when describing a surface that is firm, steady, and not prone to movement or instability.
Example: "For the best results, make sure to place the equipment on a stable surface to avoid any accidents."
Alternatives: "a solid surface" or "a firm surface".
Appalled that 4m children did not even have desks, let alone schoolrooms, he invented a "lapdesk" that sits on the child's lap and provides a stable surface.
To that end, SpaceX has been attempting to land the rockets back safely on a stable surface, rather than letting them drop into the ocean as is typical for launches.
As CityLab report, it's easier to maintain than soil, doesn't wash away, costs less than metal tree grates, keeps trees healthy and saves rubber tyres from landfill – as well as providing a stable surface for pedestrians to walk on.
Sit on a chair and make sure your back is fully supported, rest your feet on a stable surface (such as a desk), exhale as you draw the chair in towards your heels, push back out and repeat.
The Rode Smartlav mic is designed to clip to your collar but since it's so compact, affordable and high-quality, it's a good option even if, at times, you need to hold it or place it on a stable surface to capture multiple audio sources.
Ag and Au nanoparticles with large surface area and good electronic properties may provide a stable surface for enzyme immobilization.
When choosing a place to paint your nails, go for a clean, stable surface in a well-lit room.
The infant's recumbent length will be measured in a supine position, placed on a flat, stable surface such as a table.
Set your drum down on a flat, stable, surface, such as a table or a floor.
Carefully pour it into a heat-safe bowl and place it on a level, stable surface such as a table or countertop.
If you are using a plate, consider placing it on top of a tall, stable surface such as a stack of oversize books.
