Tracker modification

So for some reason the search feature on this forum does not work in my browser very well.
My Inspire arrives today and I am going to put my Tagg Pet Locator GPS on it as well as one of my tiny Loc8tor tags.

Anyone have suggestions as to what spot on the bird would be best? I know there is a thread about this but I can't find it. Thanks!!

Here are some more images of my modified GPS and mount. The velcro is epoxied in. The Tagg unit is 1.1oz