is a bit hard to make out in the pictures, but where exactly did you mount the ballasts, and how did you secure them from moving around?
3M double sided tape and the ballasts are hidden in the fenders. So far after 6 months I have had no issues with them moving around. Here is the pics...
Ballast in the fender
http://www.mazdas247.com/forum/album.php?albumid=319&pictureid=2044
and here
http://www.mazdas247.com/forum/album.php?albumid=319&pictureid=2045
Oh and here is the download to install HID kit for the H4s, not sure if there is a difference for installing H4s or H4 hi/lows but thought I would include it.
https://www.ddmtuning.com/support/index.php?_m=downloads&_a=viewdownload&downloaditemid=11&nav=0,1