Do smart curtain robots work with any curtain rod?

Most SwitchBot-style clip-on robots ship in variants for U-rail, I-rail, and round rod profiles, so check the rod shape before buying. Reviewers across r/homeautomation and r/HomeKit repeatedly flag that extendable or two-piece rods can cause the robot to slip or stall partway across the window, so a single continuous rod is strongly preferred. If you have a ceiling-mounted track or want a built-in look, a motorized track system from Remac or Quoya replaces the rod entirely rather than clipping onto it.