The Field Setup guide talks about building your practice table with a Dummy Wall:
Dummy Wall: All Robot Games have a “shared” Mission, whose Mission Model(s) rest partly on your Table, and partly on the other team’s Table, which is connected to your Table’s north side. You don’t need to build a second table, but you do need to build the necessary part of the other team’s Table, so the shared Mission Model(s) can be positioned correctly.
For Animal Allies, your Dummy Wall should have a small section of table surface attached to it, big enough to allow you to support the other side of the Animal Conservation model.
Steve Scherr