In this video I show a nice 4 outlet receptacle by Leviton that has all the wiring done internally. It's just a matter of removing the old outlet and replacing it with this new one and you have a ready made 4 outlet receptacle. Works great.
I also show how to install/ replace a plug if you're working with a backsplash of whatever material; granite, quartz, marble, soapstone, etc. You will need longer screws than the standard outlet screws.

If you want to see where I got the plug:

https://amzn.to/44vzZP3

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