In those situations, I usually create a taxonomy, even if there is a single check box.

I call it "promotion" or something like that.

Because very often, client come back and asks "Can you make a second area like the one you made on the homepage, but with other properties, that we would choose separately and show on the contact us page".

With this, I just add a second term called "promoted on contact page", and add the corresponding view.

This way, clients can check the right boxes under a single "promotion" field.