You can do it which ever way you choose but I have on mine two earths from the battery 1 to strut and 1 to body (battery in the boot) and then I made up 3 earth straps from and old amp kit. I run one from the chassis just behind passenger head light to front gearbox mount. Then another from the engine mount to drivers side front strut tower and another from the fire wall to the underside of my Inlet plenum.