In most cases, we recommend component feet be used free-standing. Although they do not "attach" to components, Herbie's compliant feet make a firm, slip-free contact. When your component is placed on them, everything will stay put, like having the brakes on.If you wish to attach the isolation feet to the bottom of your component, however, some are available with pressure-sensitive adhesive, or you can adhere them with a dab of Permatex Blue RTV Silicone Gasket Maker (available at most auto parts stores for about $6).