Given, you found the goo (I suspect oily substance), I would say the smoke and smell was a capacitor in your Converter. Just a normal failure nothing to do with your shore power.
However, since you also indicated the Microwave and Coffee pot, I'd suspect you do or did have a shore power problem.
With that said, only the more expensive surge protectors provide total protection. Progressive Industries with EMS are the best on the market. Not only providing surge protection but also monitoring for mis-wiring, low and high voltage limits, and correct frequency. TRC also makes a better unit except it only has a one-year warranty.
TravelingRVDoctor -Sent from my iPad using Tapatalk
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