Tab Resize - split screen layouts
https://chrome.google.com/webstore/detail/tab-resize-split-screen-l/bkpenclhmiealbebdopglffmfdiilejc

You can do it using a single account which is what I originally did for a short period but I decided to stop using it and just use single screens to avoid being banned (although I didn't get banned and even emailed them about this and they said my account was in good standing but advised me not to use it as it MAY lead to a ban if caught).