How does the DefenderPad (laptop radiation shield) work?

Does it only shield from radiation coming from the bottom of the laptop, or does it somehow help with radiation coming from the sides and front as well? If my laptop is on a desk, should I still put the shield under it? If I’m most worried about ovarian cancer, would it be better to have the laptop on my lap with the shield under it or on the desk? Which is healthier overall? Thanks!

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