I would suggest you buy a few of these as well. Install the main body of the bracket on the duplex receptacle neutral connection side. (See photos left side of bracket)
https://www.homedepot.com/p/RACO-1-Gang-Flush-Fit-Wall-Plate-Spacer-3-Pack-999X/304353271
https://www.homedepot.com/p/RACO-1-Gang-Flush-Fit-Wall-Plate-Spacer-3-Pack-999X/304353271