Looking to use over a 2x decking on an equestrian bridge. Should it be fastened or glued to the wood surface?

Our 3/4" Diamond Top Horse Mat Kits are large interlocking tiles that don't have to be fastened or glued, but you can glue and fasten the tiles if you like. If you do glue the tiles, we recommend using a polyurethane adhesive. The one we recommend using is our EZ Polyurethane adhesive.