Beginner Gardening: Preparing the ground for timber circular decking tiles, 0 by Karatek

Karatek wrote:
Because we are new to landscaping it seemed like a good idea to buy two ready-made large circular timber decking tiles to position down the garden for seating areas ( diameter around 180 cm/ 5ft 9inches). The problem is there is no advice on the company website on how to lay these and what kind of base is best. The garden is currently fairly flat and laid to quite chunky limestone gravel. We haven't bought them yet in case the process is too tricky. Any help gratefully received.