To connect to the same outlet multiple appliances generally use twins, tees and various extenders. Their designs are very diverse. But here’s another one, in my opinion, the simplest. Take two identical sockets with plastic hulls designed for open wiring. Connect them to pads with long screws, move the overall cable. Get convenient and secure extension cord with dual outlet.
A. GRIBOV, S. Kogawa, the Perm region.