The fine folks over at Bohemian Coding built Sketch specifically for designers who make things for screens, so it’s a natural for prototyping.
Sketch makes it super easy to set up a layout that works for you. Just go to View > Layout Settings… to configure your layout, or press Ctrl+L to view your default layout.
I’ve used this trick in Illustrator for years, and it’s the same in Sketch. If you hold Option, then click and drag an element, it will copy it. Once you’ve placed it, just hit Cmd+D to do it again and again.