In today’s “No, don’t go up there” news, I’ve printed a custom baby gate support.
Based on a design by Thingiverse user Printed_Solid, this support allows a pressure gate to be used against a post without attaching a wall cup, which would leave a permanent screw hole. I updated the original design to have longer and thicker corners to prevent strong children from pulling it off of the post, and the entire part is customizable to fit your specific post.
The SCAD script is available on GitHub, and the part can be customized and downloaded on Thingiverse.