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if you put an acoustic underlay on the slab, you have nothing to glue to- you can put engineered solid timber down as floating, provided you buy the right type (i.e. locking boards not T&G).

it depends on the boards- and what is below you. If its another apartment below, you'll need to use an acoustic underlay & floating boards. If its not, then you could do either but glued boards would normally be for solid timber or engineered solid timber while floating for the cheaper veneer...