I use the stands with Dali Fazon Mikro speakers, which seem to be similar with the dimensions. Mounting is possible with different variants, I think that should also work with the Teufel speakers. I wouldn't go for a weight of more than 2.5 kg, but you're still well within that with the Teufel...

The maximum slot height for the mounting bracket of the stand is 80mm (from the lower edge) for a 6mm screw. Check this height on the speaker!

https://images.gutefrage.net/media...
With a light weight (1.25kg) and threaded connection, this should be no problem.