Here is a pack of 2 free iPhone 11 Pro mockups by My Code that could come to your rescue. With one mockup showing both the sides of the iPhone with a concrete slab in the background to enhance the visual appeal and the other displaying the iPhone’s screen at a 45-degree angle.
The mockups do a great job at showcasing mobile app or website designs in a rather artistic and intuitive fashion. The layered PSD format of the files allows you to easily place your designs into the desired layer using the smart object feature.