A quick triple screen lock I made for my specific use case. I have three monitors on individual arms that I want to lock together when using my sim setup and then easily unlock when I want to put it away. They are ridged so they keep their position very well. I secured the bases to the monitors with double sided tape.  

This setup works great for me and I figured it might help someone else. 

I have included the fusion files so you can edit the angle for your specific needs but the angle I have is perfect for my triple dell 32" monitors since they have a curve on the back.  The top bracket is a different angle than the bottom for my screens. 

Do not print with support on plates 2 and 3.

Even though multiple bases and nuts are on one plate, I recommend printing one at a time to preserve the shape. The extended cooling time when printing all at once may distort the thread and make it difficult to assemble.