The Twinstant Mobile is not secured to the ground. Each of the towers is connected by a bottom and top ring of polycarbonate plastic which gives the system the rigidity to withstand people accidentally knocking into it. The Twinstant Mobile weighs ~330lbs and is therefore difficult to move once set up. Additional anchor holes and tamper proof bolts can be installed to further secure the system.
Twindom Knowledge Base
How is the system secured to the ground?