My table is rounded so I needed a longer reach and I also wanted to have something to hold pressure then the screw so I made a leveler. Also, I did a cable holder but I don't really use it.
The screw is tight and overall the design is really resistant.
No support needed, PLA or PETG, easy print, the first time you screw it in will be hard and it's okay.
Use the side screw for a stronger part.
I did a 90deg version for my ikea desk also.