Magnetic wreath hangers and removable adhesive hooks are good for using on glass doors. However, many magnetic wreath hangers are designed for use on a single pane of glass and may not be effective on double-pane or insulated glass doors.
Some magnetic wreath hangers provide hooks on each part, so wreaths or other decorations can hang on both sides of the glass. A clear adhesive hook may also be good for hanging a wreath on a glass door without any conspicuous hardware.
When selecting among wreath hangers, look for products that do not scratch the glass, and check the weight of the wreath against the hanger's weight capacity.