Got a question for people who use an extended storage.

So I've been struggling with my 500gb slim because of the limited storage. I also don't wanna fiddle with my PS4 and change the internal hard drive.

My question is, what brand/model of external storage do you use? I'm thinking of getting a 2tb or 4tb one. And what does your setup look like? Do you just plug in the external hd and put it on top of your PS4? Thank you very much in advance!