I have chairs from that company, and racks. They work well.
If you buy them, respect the limit on the racks. We've had 2 break because we over-stacked. They hold 18 and no more.
I can't say if the racks will hold Wenger chairs.
Related - do not ever buy their terrible music stands.
I have Wenger student music chairs, but the Wenger chair racks are very pricey. I found a similar rack, but I'm not sure if it will fit the Wenger chairs. Does anyone have experience with this? Here's the link to the chair rack that I found.