Yes, every design should have some safety factor. I have continuously seen people use mini to support 12" sub that weighs about 26 lb +-. The critical part is you DO NOT place the tip of the original speaker feet directly onto the puck mini primarily because the point pressure may well exceed the loading allowance of the puck. Use the perimeter to support the weight uniformly and it should not impose issue.
I think a more critical part is whether puck mini is effective as an isolator / decoupler. Based on what I have read, people found it is effective to isolate the bass energy and improve on transparency, details, image, etc. However, it tends to drive the speakers’ tonal balance toward warmer side but YMMV. If you found the similar and dislike it, you might want to experiment with an fairly inexpensive but effective decoupler called drum dampening pads. I used it under my speakers (Burchardt S400 mk ii) which has a similar weight to ATC SCM 11 and save myself $99. They help stablize the speakers on the top of the stands as well.