We have custom made boxes that stop power from coming back up. The technology is pretty simple - the power is passed through a relay that is engaged by the same power. Once power is gone, the relay opens and can not pass current until it is physically pressed again. I don't know that particular product you linked to, but our relays look a bit beefier than that. When I had an '87 4056E/G, I went through a few bridge rectifiers, before beefing them up, and finding a startup sequence that worked. Then it was smooth sailing.