I'm looking for suggestions as to the best place to mount a Tempe unit on a drop bar road bike. Ideally out of the sunlight, far enough from the rider not to be influenced by body temp, not obstructed from broadcasting to a wrist watch, and secure enough not to tap tap tap the frame. I don't ride with a saddle bag.

Tempe is just bigger than a quarter, has a clip, and weighs about a gram so there's no worry about it throwing anything off balance.

Currently it's attached to the Di2 junction box under the stem, but that's kind of tacky.