No, modifying the card by adding a hole is not advisable, as there's an internal NFC antenna that goes around the card's edges. Any physical alteration can damage this antenna and render the digital business card non-functional.
However, if you require a punched card, we do offer specialized cards designed for this purpose that can be fully customized and printed in full color. Check it out here.
Alternatively, you can also add a card holder to your order.