We have a stemware rack that a friend made us. It's exactly 24 inches by 12 inches, the same dimensions as the cabinet. What is the best way to install this? It looks like we either have to adhere it to the bottom outstide frame of the cabinet or, add some 1 inch filler to the bottom of the cabinet (inside the outer frame where you'd normally but in some undercabinet lighting) to make the entire bottom of the cabinet flush, then drill into and attach to that, but that will mean screws in the bottom shelf of our cabinet on the inside, won't it? How else would you attach the filler piece.

Anway, we're afraid to mess with the outer frame because we don't want to split it, but don't know if the other way is better.

Any advice? Thanks!