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You could experiment with cheap materials, problem is anything isolating tends to be squishy - e.g. half squash balls, foam - not a good thing for balancing tall, top heavy speakers on.
I am a believer in coupling for speakers and isolating everything else. Thus floating timber floor is worst possible thing. But!... how do you feel about lightly modifying that purty little floor? If you were sure about speaker positioning, you could drill holes right through the boards and into the screed, insert rawlplugs and screws. Spikes on your speaker bases then sit in the screw heads, the speakers are coupled and nobody is any the wiser.
Nice 'noys by the way.
I don’t think I explained myself well before, sorry.
I have some huge tannoy Dorset t185 on their stands, with mushroom feet.
However, my new flat has wooden floor floor laid on concrete screed. When I play some decent music, the vibration from the speakers travels down the stands and into the floor. Thus I want to isolate the stands from the floor, by placing them on a material. I wondered if there was a go to decent option for placing the stands on to isolate, before I just workout what material would be best and buy something.