Nothing I know of will protect electronics from a direct lightning strike. For the power line surges caused by a strike nearby, consider powering the mount and associated gadgets from a UPS with a built-in isolation transformer. The isolated UPS essentially acts like a mini power station where all of the lines, including ground, are separated from the outside world. In my observatory I have a separate AC circuit from the UPS with outlets for the pier, the network router, and the PC.