You can easily attach the shield behind a plastic plate with standoffs and still read cards through a (non-metal) barrier
Shure and others
3kV Forward Current If 900µA Product Range - Other details
Igt 45mA Peak Non Rep Surge Current Itsm 50Hz 350A Current It av 16A MSL - Other details
it supports power classification
KEMET C878BF35150SA0J Film Capacitor, 15 µF, C87 Motor Run Series, 500 V, Quick Connect, Snap-In, ± 5%, 20 V/µs Sensei SUR-4662 You can easily attach theThis is a Film Capacitor, 15 F, C87 Motor Run Series, 500 V, Quick Connect, Snap In, 5%, 20 V s product from KEMET with the model number C878BF35150SA0JProduct details Capacitance 15F Product Range C87 Motor Run Series Voltage Rating V AC 500V Capacitor Terminals Quick Connect, Snap In Capacitance Tolerance 5% dv dt Rating 20V s Capacitor Dielectric Type PP (Polypropylene) Capacitor Case Style Can Height 78mm Diameter 40mm Stud Size Metric M8