My 03 3 door 2.0 TDi is slightly lower on coil overs. I have been driving it daily for about a year and 19,000 miles and not done any serious damage or got seriously stuck.
Go careful! I have scrapped my sump crawling over things, but the lowest part is the plastic guards the run front to back of the car next to the sills, they will scrape on things but not damage.
The next lowest thing (Higher by about 5mm) is the mounting bolts for the front subframe, I have damaged them hitting speed bumps wrong, they sound terrible and really mustn't be damaged!
The front subframe is a few mm above the bolts, Mine is pretty badly scraped from speed bumps and hitting potholes on gravel tracks. This is not such a major issue, but it sounds horrible.
The sump is a good 15mm above the subframe, unless you go over about 20mph into a split speed bump, you should be ok, the sub frame will hit long before the sump.
Bottom line is, drive carefully! You could quite easily do seriouse damage!
I make sure to put on wheel up on split speed bumps, and gravel track and potholes are a big problem is you if you drop a wheel into one!
I have alos gotten beached while mounting half on a standard curb!