Winnebago installs shades with screws up through the shade base into the bottom of the overhead cabinets. The MCD shades are mounted in the same manner.
Ha!...you don't know my little rescued Border Collie. She hammered 2-shades and the valences..the little rascal....my fault tho,...leaving her in there when I drove the RV. Anyways, it's a thing...I don't get mad loosing a thing.....well unless it's an instrument..