This is a low cost way for protection, but it is not very precise. I would suggest semiconductor and gas tube methods that are well documented and controlled. MOV devices have been around for decades and their cost has drastically declined.
Along with these, doing the wiring routing and shielding properly will add further protection from lightning strike problems.
Tubes and semiconductors are great but a first line of defence is a pcb copper spark gap. You want sharp points in the gap. In PADS-PCB copper-shapes won't get sharp points. A component pad (square) will as it is a flashed gerber shape. You can't have the pad rotated 45deg because Pads will draw the pad insted of flashing it. So square pads are offset across the gap so there corners are almost touching, with the smallest gap your board shop will allow (in low voltage applications), say .006inch