So you ask a bunch of Flite Test fans what you should use to mount something to your plane . . . Just going to hit the obvious here: Hot glue.
Alternatively (yeah, for that, you probably want alternatives) medium-large Zip-tie around the lens, then embed the tail of the ziptie in the foam. drop of hot glue to keep it from rotating in the mount, and perhaps a bit of bracing with a skewer or popscicle stick.
Alternitively, alternitively . . . cut a notch in your leading edge about 1/3 the way out from the fuse, just a bit narrower than the camera, about half the depth of the lens. slip the camera's 1s battery into the wing, set the channel, then slide the camera into the notch. If you want something non-hot-glue to secure it to the plane, punch a small hole all the way through the wing behind it. Slide a rubber band through the hole (man, those things are handy) wrap one end around the lens from the bottom, wrap the other end around the lens from the top. if your hole is a little over half the length of the band back form the end of the notch, the band should pull from both sides and press the camera back into the notch. Flying off the wing is an . . . interesting angle to fly from, but so long as you're not too close to the fuse, it works just fine.