Please take extreme caution when drilling your panels for the tracker.
Always place a small block of wood or lead or anything under the edge of the frame and on top of
the back of your panel. You don't need a 6mm drill through your hard-won panels.
A block about 100mm long by 30mm wide and roughly 8mm thick should fit between the lip of the panel frame and the panel to protect it if you suddenly burst through the frame with your drill.
Panel frames are usually hardened aluminium to stop panels flexing, so go easy and you'll be safe. If you use the wood block as told.