Most window cat perches come with easy-to-follow instructions to help you through the installation process. Usually, installing a cat window perch is a quick DIY project. To successfully mount your cat’s bed on the window, follow these steps: Window-mounted cat perches are usually secure to your window using heavy-duty suction cups. Before attaching the suction cups thoroughly clean your windows to get the most secure hold. Some feature velcro tapes. Windowsill-mounted cat perches clamp onto the will below your window. Some of these use actual clamps that grip onto the kitty sill, while others will have you drill into the wall below the window. Wall-mounted cat perches are installed on your wall using heavy-duty screws. This install process is more time-consuming than regular window-mounted perches, offering a more secure and permanent solution.