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We need to install window guards on both front Marvin wood windows and rear aluminum windows (all double hung). It isnt clear where the best position is for these – inside the window (attached to the inside frame), outside the window (attached to wooden brick mold), or in the top window track (in front of the bottom glass when closed)… My preference is probably on the brick mold as they are ugly and black but does this work/is it safe? Do they need to be inside or ?