The product page of the WSGF Edition stand says it will hold monitors 25.5" wide.
http://www.wsgf.org/products/wsgf-edition-standThe spec page of your monitor says it's 643mm wide. Google tells me that is 25.3" wide. So you are good.
The stand page says it will do 1+3 with monitors 16" tall. Or, 2x 16" tall - 32" total.
Your monitor spec page doesn't list the height of the monitor without the stand. Even with the stand it is only 18.1" The WSGF Edition stand was designed for 1+3 with all 27" monitors. Your monitors do have a bit of extra height with the webcam. However, I couldn't imagine it not working with a 24" on top. You didn't list a model for the 24" panel, so I can't know that height.
Grab a tape measure and measure the full physical height of the two panels (including the webcam). If the total is less than 32", you are good.