Expect to lose in highly surprising ways.
most have big heavy barriers and multiple bollards and fences. some of the reston va data centers have big glorious planters out front and weird angles to walk up to the mantrap -- to prevent trucks from driving through. the generators usually have some sort of fence or bollards, and most are on multiple power sources from the local and airport grids.
source: used to manage nova data centers and did plenty of attack surface mapping. the truck-through-front-door approach is consistently considered.
However given AWS is so complex (which is required because they want to be a gatekeeping platform) leading the uptime to struggle to match a decent home setup, I'm not sure. I'm sure there's no 6 figure bonus for checking the generators are working, but a rounded corner on a button on an admin page?