The diorama is due to one of the rules being that the face has to be in the top half of the card, Torterra is quite low to the ground. The diorama is meant to capture Torterra using Earthquake.
The build is fully posable, using balljoints in every limb and the jaw also can open and close.
The Riot Unit was created for peacekeeping purposes and as such it possesses no weaponry. It's powerful frame is built to carry it's two heavy expanding shields, with powerful actuators and limbs to withstand great forces. Not for offensive purposes at all.
Although not very mobile due to their increased armour, they are able to use their shields to box, able to deal incredible damage with blunt force. They can also fold their shields up for easier movement and strikes.
These units are deployed in Metru, to areas of suspicious Matoran activity, to quell insurgencies and protect against Rahi attacks. Lately they have been cordoning off areas linking to underground tunnels. The large, towering figures are here for protection, trust in them...