I'm renovating my kitchen. The old wire to the dishwasher came up from a hole in the floor and was stapled to the floor behind the base cabinets. If course I removed it then ran wire from an outlet 4' off the floor straight down to an electrical box I put in behind the dishwasher. Now I have all this wire coming out of the electrical box ready to connect to the box on the dishwasher front bottom. Should there be some type of cover on the box inside of the wall like with a hole in it or do I just have the wire coming out of the open box then on the floor under the dishwasher.