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If you want to save yourself two pennies: [link]
I have this one with a 34" UW and a 15" 16:9 in portrait. I imagin you can fit a 29" and a 24" on just fine
You can use one, grab a "gas spring mount". With a gas spring monitor arm/mount you'll be able to adjust the heights very easily and put them exactly where you want.
This one [link]