My Holleys were mounted so that the inlet and outlet was below the bottom of the tank. They still failed.
The Carter can be mounted something like up to 18" above the top of the tank - double check the instructions. Much more versatile.
If the position of the pump can result in failure, I imagine there would only be a threat once the fuel level in the tank drops below the level of the pump. If that is correct, position it right at the bottom and don't run it out of gas.
Because the fittings are on the very bottom, the Holley pump will not be much lower than the tank when positioned correctly so there is probably not much more of a threat of being hit than anything else under the car.
The design of the Carter, on the other hand, could require mounting above the bottom of the tank to avoid road threats.. It has the fittings near the top.
Lawrenceville, GA