Impact of water tanks on house foundations

Hi everyone. I'm thinking of installing two water tanks against the side of the house. They would be about 1.2 m tall, 3.5 m long and 1 m wide (due to space constraints), meaning that each square metre of ground would need to support approx. 1200 kg of water (if/when the tanks are full). They would be positioned on a minimum 100 mm thick concrete base (to be constructed). I'm aware of this kind of load potentially causing failure of downslope retaining walls but I can't find any information about risks to building foundations. The house is built on concrete pier foundations under the perimeter walls, with stumps supporting internal walls. The tanks would be against a perimeter wall. Does anyone know of or have experience with the risks of these kinds of loads to house foundations? I see taller water tanks against houses all the time, so I'm surprised that I can't find more information. Thanks in advance!