Do you want WiFi in the attic of your house without running cables? In that case, choose a powerline adapter with WiFi. These are WiFi amplifiers where the network signal is routed through the power network in the house. You don't need to have network cables at home for a stable internet signal. So you can also go online in the attic to surf or stream. Do you just want an extra WiFi network in the attic? In that case, choose 2 powerline adapters. Do you want a network in more parts of your home? Then choose 3 or 4.