Upgrade your electrical system. The house I live in now was built in 1880. It probably had no electricity when built and over the years, probably went from 60 amps to 200. The previous house I owned in NY was originally built in 1780. I had the electrician pull out as much unused wire as possible and rewired the panels-- it was over 6,000 sq ft, not including outbuildings, pool, etc.
Worth doing right. It's not just safety, however important; it is also quality of power.
This is not an area where you look to save a few bucks. Get it done properly by a competent electrician. Far less costly than black boxes and mystery tweaks.