I wonder if my old style window shade tention reinforcements would be an alternate choice. They are designed for high-impact, marketed to protect walls from door knobs. They even have tapered edges for the rollers to ride up. Maybe they are ideal, and then maybe a flop. I don't have a slide to test them on.
From My Main "Tips & Tricks/Enhancement" Article
5) Window Shade String Reinforcements
I reinforced the shade tensioners that hold the shade strings at the bottom. No more issues with those things pulling out of the wall when bumped hard, and bumping them is very easy by the dinette and bed. The solution looks nice too. Write-up, pictures & drill template available. Provide your email address.
Cost Of Project $3 per window