Also, as a belated addendum, the mats in that youtube aren't there for any particular target purpose (although I think they did help a small amount in that respect). I put them there because Pongu used to drop the metal articles a lot both on the pick-ups and on the formal presentation at the end, and if the metal hit the wooden floor then it made a noise, and if it made a noise he'd freak out and refuse to touch the articles again for a while, and so I put the mats there to muffle sound and help him be less crazy.
If you do not have an insane dog then you probably don't need to worry about using mats for this.
ARCHMX TDCH Pongu the Insane, CD-C, RE, RL1X6, RL2X5, RL3X2 (GSD mix, b. Apr 2010)
Crookytail the Tigerwuff, RL1, ITD (Akita mix, b. Jan 2011)