I assume (you don't say) that the laminate is too reflective for your Summits to sound right; otherwise why put a carpet over? A fitted carpet is just that; fitted, which really does need gripper rods to be properly laid. Why not get a largish rug to lay between listening position and speakers; much easier to accommodate in a new location.
I couldn't imagine speakers without adjustable spikes or decouplers of some sort, and as already suggested, put concrete/stone slabs directly onto the laminate and decouple/ adjust from them. My large Quads come with adjustable spikes, so I'm surprised speakers of the calibre of Summits don't.