Simple + cheap solution for ground distribution:
Get some blank (no isolators supplied) 4 mm sockets, some copper-clad board, solder them down on the board (that's mechanically rather rigid for our purposes), get some green/yellow PE wire (1.5 mm^2 preferably), get a Schuko / whatever you country uses plug, remove the phase/neutral contacts(!!), fill contact holes with hot-melt. Solder PE wire to board and connect to PE contact on the plug. Bolt board to underside of your work bench / whatever.
Board is hard grounded, but that's not an issue since the spiral cables to connect wrists bands all have 1 M? resistors built-in. Also, other stuff on your bench might want a hard ground.
Many (all?) ESD mats are made of synthetic rubber and stink like rubber hell for a good while.