I like the one that you linked better than the covers, I also think it will be safe espeically as they get older and more skilled at taking those little plastic things out.
I have a bunch of the plug insert things already but i think I might get some of the sliding cover things for the commonly used outlets - for things like the vacuum because dealing with taking them in and out all the time might drive me crazy...
Re: baby proofing
We got the boxes that close over the outlets. Things can be plugged in and the box goes over them so baby can't pull out the plugs.?
https://www.toysrus.com/product/index.jsp?productId=2792248?
I have a bunch of the plug insert things already but i think I might get some of the sliding cover things for the commonly used outlets - for things like the vacuum because dealing with taking them in and out all the time might drive me crazy...
Hmmmm