I use a macbook pro with two dell monitors are work. Unfortunately, MacOS seems picky about remembering the display orientation of two identical monitors. If I don't plug them in in the same order and port each time, it mixes up which one is in portrait and which one is in landscape.
Which is frustrating.
So I took my calipers to work, measured the USB-C to display-port cables I was provided, and made something in OpenSCAD to make my life a little easier.
I recommend printing it on its back, with the chamfered edge down. This orientation requires no supports and removes from the build plate more easily.
Obviously, you'll want to make sure your cables will fit before printing. I've included the scad file so people can tinker around and get a perfect fit for their application. I may even go back and make a new one that can take two differently sized cables.