I’d run one on each side of the left axle bearing to hold the axle stationary. The axle moving could cause your brake rotor to drag and at best slow you down. Worst case is the rotor exploding.
And I’d put them inside the hubs to prevent the tire moving in and contacting body work or the chassis.
yes i use a total of around 9 or 10 to keep everything in place. Im actually considering making myself a set of beefy collars to hold my axle clutches in place because i have the space. Also I use blue loctite on the ones i move often, and red loctite on the ones around the brake rotor, axle clutch, just to be safe. Ive lost a couple before on track