An adapter plug is included with every grounding product, which allows 2 items to be grounded.If you have multiple grounding or shielding products, you can work with your own grounded extension cord in a grounded socket and place several supplied adapters in it. Or even better, you can use our standard cable junction box. Then there is no voltage on the extension cord which you would rather not have around your bed: https://aarding.org/products/earthing-distribution-boxYou can also use this junction box to connect multiple products to the cable of an earth pin if you so choose, in the absence of an earthed socket nearby. For multiple connections to a radiator (tube), use the junction box with alligator clip:https://aarding.org/products/alligator-box