We have a toddler grandchild visiting occasionally and need to secure the outlets. This cover, while it is of a generous size, does not accommodate plugs of certain configurations. It is wide enough for all my smart plugs, but could not close over a USB brick that I have that is long and sticks out of the wall with the cable sticking out even further.
Opening the cover is a bit of a pain - just pressing the top and bottom spots does not help - you have to use both hands to pry it open. But then, once installed, I would rarely need to open it.
This was the best I could find and serves the purpose. Just be aware of size limitations!