I use the tape-it-in-place method as well and it seems to work fine. Just yesterday, though, I transferred two beers to the secondary carboys. I tried a little different method and let the bungs sanitize for a while then, set them on a paper towel, bottom side up, to dry for a bit. They locked right in place.
Kegged: Magnum P.A., Black Currant Blue Agave Black Peppercorn Saison, Keller Bier, Hefeweizen, Chocolate Saison
On Deck: Chuck Norris IIPA, Apricot Blonde, Raspberry Wheat
In the hole: