PowerCube can be extended infinitely, as long as the devices you connect do not draw more than the rating specified on the product.
However, we recommend you to attach no more than two PowerCubes to one mounted PowerCube.
For sure! PowerCube is as safe as any other power outlets as long as you don't overload it by plugging in multiple appliances that altogether exceeding the current rating of 4000watts = 16A x 250V.
