Hello! Yes, they float on 3/8" standoffs. However we do have adhesive numbers also that are flush. When you order a plaque, we'll email to ask for the address you need on the plaque and you can then tell us if you would prefer adhesive flush numbers. Standard are the floating style. Thank you for asking. I would be happy to answer any other questions you may have. Note;the photo below shows the thickness of the plaque, and you can see the attachment hole in the top right hand corner.

Ginger at houseArt