Sorry, guys, had a bad night and I’m really not feeling well, I have to leave it to others to go into details.
Meanwhile, here is the buttons FAQ which lists all the button devices that currently work with SmartThings, so it should be of interest (this is a clickable link)
And here’s the device class features FAQ which should give you good information on selecting a plug-in module. We call those “pocket sockets” in the forums just to distinguish them from the in wall outlets.
( also, I’ve moved this to projects so you can get individualized responses based on your own needs and preferences.)