Aurora R7, compatible RTX 2080 or 2080 Ti, PSU query

In understand that only smaller cards will work in these systems. Some people have commented that dell use MSI aero cards (OEM)

does anyone know what 2080 or 2080ti cards will fit.

I saw some earlier posts with people ripping off part of their cases to get cards to fit but dont want to go down that route if i can help it.

The aurora i have ordered only has a 460w PSU. Are these fairly easy to remove and update.