The CHE will be above the reach of the tortoise, same as any other overhead heat source, so you will not need a guard like the ones you may see on brooder lamps.
Brooder lamps were designed to keep baby chicks and adult chickens warm. In that situation, the guard on the lamp fixture may keep the birds from bumping into the CHE or accidentally getting burned.
Hi is this CHE ok? I can select it without the guard as well