These Options Are Only Suggested Positioning & Should In No Way Be Taken As "MUST DO"
If You Can Locate Your Coils In A Better Position, Then Please Do.

If You Are Using A Wedge Shaped Air Filter (Recommended), You Should Have An Empty Void Between Your Oil Tank & Battery Box.  This Void Can Be Used As The Location Of The Twin Coils, Which Can Be Simply Positioned Using 997117SS Clamp.

If You Are Using An Original Air Filter e.g. 019667, Then Your Air Filter Will Fill The Space Between The Oil Tank & Battery Box.  In This Case, There Are Alternative Options:-
1] Inside The Tool Tray (The Photo Shows Other Electrical Items Inside The Tool Tray But Their Is Plenty Of Room For Two Coils As Well If Positioned Neatly)
2] If You Have A Racing Alloy Tank, You Can Mount Then Onto The Head Steady Using 2 x 991151SS Clips.  These Clips Are Mounted Using 4 x Spacers, 2 x Through Studs & 4 x Nuts.  You Will Need To Source Your Own Spacers, Studs & Nuts To Suit Your Requirements.
3] Another Alternative is To Mount Then On The Outside Of The Frame Tubes Under The Tank (No photo - YET!)