Hardware list for testing website layout

I understand for testing websites that run cross-platform (iOS, iPadOS, MacOS, Android & Windows) and cross-browser (Chrome, Safari, Internet Explorer, Firefox, Opera) that you're better off using physical hardware and not emulators.

When purchasing hardware for testing, is it important to have a device in different aspect ratios? For example; a current-gen iPhone 11 has an aspect ratio of 19.5:9, while iPhone X has an aspect ratio of 13:6.

Is there an up-to-date list of the necessary hardware for web development?