And what do you expect UL to do about it?
I sent a message to UL, about this, to see what they say.
it is not a UL listed item, but web site in the link does state "Approved to UL standards by CSA" which could be a violation of UL rules. as it is saying this item would be listed by UL if so testing was done.
I don't think (I could be wrong) UL will list an item if it violates the NEC, which by 314.29 I think it does.
I will post their reply as soon as I get it.
Here is what I see wrong, NEC requires access to the wiring in the box's 314.29, with this set up, you can not access the box, without damaging the wall, and or the screws that attach the adapter are covered by mud, which would render them un accessible, so if a electrician needed to get to the box, he would have no idea where to look for the screws.