I’d love a robotic vacuum. However, my house is not very flat. It has two main floors, but several rooms are offset from the main floors by about a foot or two

I’d love a robotic vacuum. However, my house is not very flat. It has two main floors, but several rooms are offset from the main floors by about a foot or two (who knows why). Is it possible to put a small ramp on the stairs and tell the vacuums how to navigate it?