I have a lot of portable monitors that use 75mm or 100mm VESA mount, but they are light enough to use a 11" friction arm from SmallRig or something similar to mount instead of using a typical VESA arm. I love having a small 16-18" monitor under my main 39-49" ultrawide setup at my desk and portable monitors from UPERFECT work great for this. Some portable monitors have only 2 screw holes, while others have 4. I designed a bunch of different brackets for all types of monitors. I left spaces for arms or mounts that have the safety pins on the outside of the ¼"-20 screw that stops whatever is mounted from rotating. I'll link a friction arm from SmallRig down below to show you what i'm talking about. You'll need a single ¼"-20 heat threaded insert to complete one of the brackets. I love the ones from ruthex but any that are 12.7-17mm in depth should work fine.