Wouldnt the smart thing be to just raise it up a bit? Can still have it low just not as low as current level. Probably end up looking better tbh as standard rediculously low cars on standardish wheels look pretty gash or just look broken. Just saves you spending hundreds on sumps and sealant all the time and probably cv joints and tyres in the future.
I used to run a mega low polo a few years ago, and also run into the usual sump smashing problem. I bought some spacers that fitted under the engine mountings that lifted the engine approx 25mm which sorted the problem. I think I had them off ebay, not a bad job to do as I remember.