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You voice a very legitimate concern regarding the speaker stability, and one that I don't think has a simple answer - especially if the speaker has a high center of mass.
Experimentation and perhaps some form of attachment such as an adhesive Velcro placed between the speaker & decoupling material and between the decoupling material & rigid surface beneath might work to help stabilize the speaker while still allowing for a mechanical decoupling to occur.
Additionally, whatever you use to decouple the speaker, I would attempt to avoid having any extending surface (including the decoupling support) extending (in front) beyond the speaker face, as it risks becoming a source for an early reflection or diffraction (an ETC can show this).
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