| I bought a Stat-B from a luthier who included some old broken bridge pieces to build up the hole if necessary. My bass (New Standard Cleveland) has inverted egg-shaped holes, with the pointy side of the egg facing down. Many basses have more evenly circular holes, with a flattish bottom that enables the pickup to stand more or less straight up.
My Stat-B is fairly loosely wedged in at about a 45 degree angle (the metal part is pointing roughly toward the E-side bridge foot). I carved the top of the cork to fit the curve of the upper part of the bridge hole and wedged a few spare bits of cork between the side of the hole and the side of the pickup. It's a little bit kluged, but it's never come out on its own. I wouldn't recommend gluing any part of the pickup itself.
This explanation will probably make zero sense to anyone unfamiliar with the Stat-B--sorry. I love the way the pickup sounds in this position, and I've actually found that it's not too critical to have the black part (on the bottom of the metal thingy) in full contact with the bridge, at least on my bass.
IME putting the pickup in too tight will cut bass, compress the sound, and mess with the string balance. I've been pleased enough with the Stat-B's sound the way it's mounted that I've never bothered to build up a little wooden mount for it. I've also experimented with it upside down; in the E-side hole; and in the bridge heart, but it definitely sounds best pointing up in the G-hole.
The Stat-B sounded great when my bass had old Spiro Mittels and a set of gut-like Innovation Honeys. It's a little bright with new-ish Pirastro Jazzers so I'm using the BassMax more these days. The preamp can go from super low to line level while barely using any battery, but I wish it had a phase switch and a mute. Oh well--it's a great way to get away from the piezo sound. | 
