Nope, those electronic units are absolute garbage when used as advertised.
I believe they CAN be effective on boats where the whole vessel is in salt water ( like how sacrificial metal blocks are bolted to outboard motors for effective protection but won't work when bolted to ya car)
I hear some of those rust inhibiting plastic stick things can work well.
https://en.m.wikipedia.org/wiki/Volatile_corrosion_inhibitor