If you look closely at your picture, you will find a round plastic - not soft rubber, bung/hole plug/cover, there is another one on the other side and 2 near the rear of the car. I removed all 4 of these round plastic hole covers and replaced them with Audi TT Jacking Point Protectors - and use all 4 of these points to use 2 trolley jacks to lift the car up, one side at a time before placing jack stands under the strong points that you have indicated - ie where the car jack is fitted under when changing a wheel/tyre.
So, I can't see any good reason why you can not place a wooden block at one of these points at a time, and jack the car up. Maybe remove the plastic hole covers first to avoid breaking them - maybe even, if you have time, make up a locating "plug" that is secured to the lifting block so that it is always in the correct position when using these 4 strong points for lifting the car - I am meaning just screw/fix a small bit of wood etc to the block of wood, the correct size to fit up into the hole left in the car frame after you have removed these plastic hole covers.
I'm guessing that it is one of the O-ring seals that are fitted to the oil separator that is the
problem causing the engine oil leaking out - these oil separators do have a finite service though, I replaced the one on my wife's old 2002 VW Polo 1.4 16V, the one fitted to your car is an evolved version of that one - from memory of what I noticed on my older daughter's 2009
Ibiza 1.4 16V.