At our strata, we highly recommend an in-situ acoustic test of a selection of products be done prior to purchase. Else there is a risk that an application starts on the wrong foot.
As for the application –
I would make a sketch of the areas being affected and detail the precise scope of work intended, including the type of flooring, underlay, installation method.
For example, in a recent application I received for consideration:
“A minimum 10mm isolation air gap will be maintained between the above floor components and the walls, at all wall/floor junctions and a minimum 5mm isolation air gap between the finished timber floor and all architraves and door jambs This gap can be treated with installation of foam backing rod, and flexible polyurethane sealant”
Hope this helps