As a general rule of thumb, any kind of rug placed onto stairs can be unsafe. The key to keeping your stairs safe if using braided rug stair treads is installing the treads correctly using proper padding and carpet anchors. Once the treads are properly installed, the treads won't go anywhere.
Inspecting the Treads
Before installing treads, it is important that you inspect each individual rug. Look for signs of fraying or loosening at the edges, as this indicates that the tread will have a short life and could pose a tripping risk. Additionally, measure the width of the tread and verify that the entire tread will fit cleanly onto the step. Any overhang also poses a tripping risk.
Rug padding is a non-slip pad placed under each stair tread. The padding has a rubber coating that grips to both the stair and the tread. This grip prevents the tread from moving and pulling on the anchors. This in turn prevents the anchors from coming lose or causing the tread to unravel.
Carpet anchors are tacks that are positioned on both sides of each stair tread to hold the tread permanently in place. The tacks are a type of nail that permanently inserts into the wood of your stairs, so the wood will be slightly damaged. Regardless of the damage, this step is necessary when using braided rug stair treads, as each tread is independent of the rest.
For those who would rather not use carpet anchors, the alternative is to use a long, solid carpet runner. This type of rug can be installed using carpet dowels secured to the back of each step. The advantage of this route is that the rug is held firmly in place without any damage to the rug or the stairs.