How much weight can the floor bear on average per square meter?

I don't know anything. Just by guessing, your current load is about 5kn per square meter. According to the functional standards of office buildings, they are generally not that big, and the design is about 2.5kn per square meter. However, this is based on the fact that everything is everywhere. If you only have one device, you can divide the device by the area of the grille to get the average load. If it does not exceed 2.5, there is almost no problem. It's best to consider the local pressure a little, but you don't know the thickness and label of the floor, so the local pressure can't be calculated. )