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Prop: A prop can be anything large and sturdy enough for you to push yourself off of. This includes a creature that is larger than you or a wall, column, or other durable terrain feature. The GM decides whether a creature or object counts as a prop, depending on the circumstances. For instance, the GM might decide that you can’t use a Huge ooze as a prop, due to the consistency of its protoplasm.
Does a 5ft object count's a wall/column for a Large+ character? Does the ground/ceiling counts if something like Walk on air or Reverse gravity is affecting it?
Does a wall that it's tangible but can be moved through like Wall of Shrubs counts?
And if it's imaginary like with the spell House of Imaginary Walls when I try to apply Stunt Damage to a target if the target does not disbelief the spell, it takes physical damage or mental damage?
When applying "Stunt damage" does the prop check the target size or the player size?
Basically, it is up to the GM to decide.
But as a general response, if it is stable and hard enough, you probably can use it as a prop; only creatures need to have this size difference.
About the usage of the ground as a wall. RAW it's valid, but I think that most GMs during this playtest weren't authorizing this because this can easily trivialize the prop (but honestly, there are so many ways to trivialize the prop that it makes me question if it wouldn't be better to just remove the prop rule at all and just give the benefit all the time).