Fixing freestanding cabinets

Hello All

I will shortly be fitting my kitchen cabinets, my first attempt at doing so. We will be having a u shaped kitchen, two sides fixed to a wall, the other exposed at the rear.

I take it the best way to secure the exposed side is to drill through the legs into the floor, or is there some other preferred method, maybe timber batons (themselves fixed to the floor) running on the inside of the legs, to stop any lateral movement of the cabinets.

Any advice appreciated.

Steve