Portable ramps typically stay in place through a combination of factors. Firstly, they often feature a textured or non-slip surface on the contact area, providing traction and reducing the risk of slippage. Additionally, many portable ramps come with rubberized or grippy underside materials, such as rubber feet or strips, which help to anchor the ramp firmly to the ground or the surface it’s being placed on. Some ramps also have built-in securing mechanisms like straps or hooks that can be attached to surrounding objects or fixtures for added stability.