I put the 'E' on the side, as I don't have the onboard fire system.
The lightning bolt usually has a blue triangle base here in Australia it is 4".
I think it is requirement of the Confederation of Australian Motorsports - CAMS. For track or race days.
I usually have it on the boot/trunk lid on the side that the battery is on.
I'm not really worried about placing the 'E' as I also place the Goodyear sticker/decal and run B. F. Goodrich tyres/tires.
Just like the look of the decals and the luxury of being able to remove them in minutes...
