A surround on a fireplace can mean a couple of different things to people. It might refer to the decorative front around the glass. Or, it may mean the finishing material around both sides and the top of the fireplace. Part of this finishing may or may not include a mantel.
There is not a right way or a wrong way to finish an electric fireplace with a stand. It’s all a matter of personal preference. Some like the clean and contemporary look of a simple trim surround for the front. Others like the more traditional look. Like mantels, there is not a certain surround for electric fireplace. Use your imagination, beauty is in the eye of the beholder!
Remember to check for any specific clearance requirements that may be necessary for your particular model.