Hi, I'm renovating the villa and now plan to install rigid foam on the concrete slab. I was thinking of placing regular RJ45 cables in electrical conduits on the slab and then cutting out in the foam. But I thought of skipping the conduits to save some money and laying the network cable directly on the slab and cutting out in the foam, skipping the conduit that is. Can this be done? Regular RJ45 cables can't get hot, right?