It is not always feasible to set the ladder on its “feet” as they are narrow.

I suggest having different mountable feet. A round disc. A perpendicular bar. An ice peg. A hole for a bolt. Whatever fits your need.

It is not uncommon to have the need for a ladder on uneven ground.

I suggest a ladder where one leg is adjustable for compensating slope or uneveness.

The ladder I use the most is made of I profiles so it should be doable to hide it in the concavities. Or mount it around the leg. Or have it totally separate.