Drawing out the patio’s dimensions and fictional corners is always a smart idea, regardless of the type of patio foundation you choose. To break off the corners, use thread, and sturdy poles. Then, mark where the ground excavations are located and where the concrete plinths are situated. When seeking a particularly sturdy basis for their patio, people frequently find that concrete adjustable plinths and balconies are the best options.
Source: https://articlerod.com/building-a-balcony-plinths-instructions/
