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That's what I'm doing, I use an xtar model, 6 way and stays cool but can provide quite a few amps to all the usb sockets simultaneously. Of course it looks neat to have them on the sockets and non technical people love them but there are some pretty obvious design problems building safety and a decent transformer into the back of a plug socket. I assume most of them will be consuming current constantly too.
Thought you might be the man to know! Your thoughts might be what I had picked up on. My view is (having just had a whole house rewired at significant cost!) is that I haven't gone with them. I have instead used multi-bank chargers so 4xUSB from one plug socket, means I am not stuck having to change them in the future. We went Hager everywhere.