Do not buy this one on eBay as they are probably as expensive as buying new ones directly from the web shop n Denmark.
They work exactly like LC2 when used with a Beo4/5.
They can be touched, on the metal part.
They are not as sensitive as the LC2, but are OK and I would recommend them as a good alternative.
Buy it from here:
http://www.home-automation.dk/pl/_Dimmer_11.aspx
You see, one is only 66 euro, you can get white ones, and you can also get them by pack of three.
Be prepared to way 3 weeks to receive them, but you'll get them and they would change them if they do not work.
To mount them as wall switches would require 2 things:
-That you have access to the neutral and live, which is rare in the UK.
-That you nail or screw the bottom part of the SmartDimmer to the wall and cut holes in the bottom part of the smartDimmer shell to get the cables through. Of course they are round, so you'll have to fill the gap around them.