The beam I want to attach this to is on the side of the gazebo which is on a slight angle from being perpendicular to the slab. How does that work?

Thank you for your question. If the mounting surface is at a slight angle, the shade can often still be installed as long as the brackets are mounted securely and remain properly aligned with each other. The key is ensuring the roller stays level so the shade raises and lowers smoothly. For angled gazebo beams, you may need to use a mounting block or shim to create a flat, level mounting surface for the brackets. We recommend measuring the angle and reviewing the installation area carefully before installation.