QWERTY US - QWERTY International OS Layout

You can choose whichever you prefer…

Adding US International PC as your input method will apply to either an ANSI or ISO keyboard, with almost the same results.

I would choose based on where you expect keys such as ` ~ § ± to be, as they move between the two physical layouts - ANSI has a 'missing' key left of Z compared to ISO, which will force your grave accent up to the very top left key, rather than next to Z.

So, the input source will adapt to whichever physical keyboard you use. This is British & US International on a UK English keyboard…

Both input methods also contain the standard Mac dead-keys on Opt ⌥