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Roger Mills wrote:

The stair carpet should be fitted with one gripper rod near the bottom of
each riser and another near the back of each tread - with the spikes
pointing towards each other.

away from each other?

No towards each other.
Each strip of gripper rod should be pointing towards the corner of each
stair i.e. towards each other.

If they pointed away from each other then the gripper rod would have no
effect at all.