As it is a defensive ability, it can be destroyed by both plants and zombies. Its alternate abilities are Shield Decoy and Future Dummy (Garden Warfare 2 only). It takes 30 seconds to recharge one Dummy Shield, two can be deployed at a time.
▼ Max number spawned per player was decreased from 4 to 3.
Strategies
With
Dummy Shields do not exactly work like the Tallnut Battlement, as it higher than the Tallnut Battlement but is not as wide, allowing it to fully shield a zombie. This can be used to provide cover for fellow zombies during an attack, and you can also hide behind it yourself if needed.
In Plants vs. Zombies: Garden Warfare 2, keep in mind the Imps in and out their mechs, may still be vulnerable behind Dummy Shields, as they are not as protective at the bottom, and Mechs are larger than the Dummy Shields. To somewhat remedy this, they can stand on another zombie's head, such as the Foot Soldier. Standing on a Super Brainz will not work, however, as the model is too big.
Similar to how Spawnable Zombies attack Tallnut Battlements, Weeds will attack Dummy Shields on sight, making them a good distraction if the player is getting swarmed by Weeds. Be aware though, attacking said Weeds will cause them to switch targets and go after you.
Gallery
Dummy Shield's stickerbook description in Garden Warfare
A similar thing happens on the plants side of Backyard Battleground with a Dandelion Weed and a Peashooter interaction.
Coincidently, they are considered to be the most popular classes in the Garden Warfare series.
If an All-Star starts a match on the soccer field, they can jump onto the shield and make a tower. This can continue until the Soccer field's effects wear off.
In Garden Warfare 2 if the Team Swap glitch is active, the All-Star can gain EXP from destroying his own Dummy Shields.