Good question — they actually use two different stand systems, each built for different priorities.
The metal plate versions use a flat iron base plate design: two wide, weighted base plates sit on the ground and support a rigid frame structure. It's lower-profile, extremely stable, and designed for use on backyard grass, patios, campsite gravel, and flat surfaces where you want something rock-solid that won't wobble. Ground stakes anchor through the base plates for added security.
The tripod uses two telescopic tripod stands with adjustable height — great for larger gatherings where you need maximum screen height and the flexibility to raise or lower the display. Same anchor system: four ground stakes plus wind ropes keep it steady in a breeze.
Both designs are built for real outdoor conditions. Neither requires sandbags.