i need a sideboard for my dining room to store nice dishes, platters, etc... already have 4 woods int he room & don't want to introduce another & so am considering a black metal piece with glass doors. however when you close the doors, the piece jiggles a bit & of course anything on a metal shelf does to ... advice? wondering if i just put down some shelf liner to absorb the jiggling if that will help? am going crazy trying to find something (and 99% of these pieces are wood) thx!