The most I've done is drill a hole so I could attach it to a key-ring holding all my other charging cards.
I used the light approach mentioned above to help avoid the antenna traces when I drilled. The traces did look to be typically near the outer edge of the card, so I had to position my hole somewhat more to the inside than I would have preferred.
Pearl White 2016 Leaf S, 24kWh battery, 6.6kW charger upgrade
Nissan All-Season Floor Protectors
ClipperCreek LCS-25P (NEMA 14-50P)
BAFX OBD2 Reader, LeafSpy Pro
Ohmmu T12403 LiFePO4 12V Battery
Enkei Racing RPF1 16x7 Wheels (2x so far)