You can see if what he has works (he talks about his arm setup around the 3 minute mark).
He also had the link to the arm attachment he uses in the comments:
I've actually got that exact Artisul D16!
Cons: It might just be how I handled my tablet (shrimp mode w/tablet in lap), but I've had it for two years now and I think their HDMI cabling could be better. The port is a bit loose, and when it disconnects I need to open up the driver program, re-map the pen to the tablet, then bounce my display resolution to get the pen running in the right direction because I use it in left-handed mode. I also had to go and buy an ultra-thin HDMI cable because the cable that it came with is super thick and ended up breaking internally from the bending. I have it on an arm on my desk now (two links there, take note) and the loose port is much less of a worry, although it does still get loose and come out sometimes.
Pros: 16" tablet is a great starter size. I love the shortcut keys and the dial. It's made my workflow nice and smooth; I edited two to use the Photoshop canvas flip function as well as value proofing. Artisul's tech support is GREAT too - I had a bizarre driver issue after a Windows update last year. XP Pen had me record a video of the issue, then custom-coded a new driver for me that fixed it. It was a great eexperience!
I actually also had an older model of that 12" XP Pen that you linked there prior to my Artisul. I don't remember a WHOLE lot about it except the HDMI cable was the same (I went thru about a cable a year due to the weight eventually just breaking internally from bending the same way, look for an ultrathin HDMI cable). The tablet itself I didn't have too much of an issue with, but IMO a 12" tablet definitely felt cramped once you had to take into account your program's UI made your actual usable drawing space smaller. I also had some tech issues at one point, and they schedule a live troubleshooting session with you for them to remote into your PC to figure out and fix the issue. Again, excellent tech support!