As a counterpoint, I have done exactly that and used Copydex to glue the cork down, but my baseboard is a 50mm sheet of extruded polystyrene, so I was able to punch through the cork & into the foam below with a bradawl rather than drilling. The track is also glued down with Copydex, and I plan to use a water/Copydex/IPA mix to glue the ballast. I should, in theory, be able to achieve that much sought after acoustic decoupling!