Simplest is the Blue Museum Putty.
I am fond of using the adhesive black rubber non-slip grippy dots on the top plate with a foam monitor pad on top of that. This really helps protect the Speaker from any scratches.
In almost 5 years using 36" VTI and now some 32" Monolith stands, only once did The Lady almost take a Speaker down.
If non of that works for you...
Drill through the stands and bolt your Speakers to them!
(Of course resale value will be destroyed, and you will absolutely void any warranty from Arendal.
)