Keep the menu link stable
If a printed code points to a permanent menu page, you can replace the menu behind the page. Avoid links to a temporary file that guests cannot open.
Consider placement
Use matte signs where overhead lighting could cause glare. Test the sign at a real table and avoid placing the code over a fold or curved surface.
Plan for different guests
Offer a printed menu alternative. Put guest WiFi and the menu on separate codes with labels that make the action clear.