A small electric all-in-one may be the right thing for you. If you are making smaller batches than the capacity of the system your chance of a boilover is zero. Also, a 120V unit will not have any problems bringing a small batch to a boil quickly.
I have the Brewzilla and I love it. Contrary to reports i don't have any issues with it coming to a strong boil (relatively quickly, too). But should be fine for 2-3 gallon boils with plenty of head space. I'd still use some fermcap which will mostly eliminate the problems of boil over on just about any set up. FWIW mine boils over all the time if unless I add fermcap