I have just been told that a bride has bought an acrilic heart topper for her cake. this is the one

http://www.myweddingfavors.com/personalized-acrylic-heart-cake-top.html
how easy is it to add it to the cake? to me it looks like one of those great ideas on paper, but in the cake world is a PITA.
I normally place a little board with some supports under the topper, but in this case I dont think it will be possible? Any advise?????