You simply need about 10cm of space under the table so that the clamp can be mounted correctly. If you have this distance to the edge of the table, it's not a problem.

You can connect a 34-inch ultrawide monitor and a 32-inch wide monitor to the mount, as the mount supports monitors from 15 to 35 inches. It is important that the weight of each monitor does not exceed 15 kg and that the VESA standard 75 x 75 mm or 100 x 100 mm is met. The maximum load per monitor is 15 kg and the mount is suitable for flat rate and curved monitors.

For 24 inch screens with thin frames, it could (emphasis on could) just about work. However, the lower screen is then completely on the tabletop. For an over-under array, I would use a different mount.

Without much effort, you align the monitor according to your needs and can swivel, tilt or rotate the monitor itself, e.g. for portrait monitors. The support of the integrated gas pressure spring makes it easier for you to adjust the height of the monitor.

I assume that it is per arm. I have a 35" 21:9 with 12 kg on one arm and an eizo with 9 kg on the other. And that works without problems