I suggest a different approach...
Google "Vertical VESA double monitor stands" and take a close look at the various mounts presented.
Then refine your search criteria to narrow down the options that meet (or could meet) your requirements.
Pick 2 or 3 that meet your requirements.
Read the specs and details very carefully. Pay close attention to the installation/user Guide or Manual. Not uncommon that the monitors may get in each other's way when you actually put it all together. All may not actually fit in the end. Watch the tolerances.....
Size, weight, and balance all matter.
What is your budget for the monitor arm/mount? Do not go cheap. Especially with those large monitors.
Many such stands can be mounted in a variety of ways: floor mount, desk mount, wall mount. The mounting needs to be very strong and secure. All the more so if the monitors get moved or otherwise swung about. Screws, clamps, etc. will work loose and fail with very bad results. Solid wood is a must.
Once you have selected a couple of potential candidates then post your choices.
Members can then respond with ideas and comments based on personal experiences and knowledge.
You need to provide a starting point.