Doesn't make you right either... try reading some scientific literature with actual citation and expertise rather than using google to get some random quote from a site called homebrew.stackexchange
so you want something that plugs into your 20a socket, which has 2x 10a sockets?
as long as it only plugs in and isn't permanent wiring, and the cables match the same size as the 20a subcircuit it shouldn't be a problem.