Yes. You can purchase additional adhesive strips from the Roku accessories store.
The Roku Express and Roku Express+ both ship with a one-time-use removable adhesive strip that can be used to attach your Roku® streaming player to a flat surface such as a cabinet, table or even the side of your television.
How to attach your Roku Express or Express+ using the adhesive strip
To ensure proper operation of your Roku remote, follow the guidelines for correctly attaching your Roku Express or Roku Express+ using the adhesive strip.