Amazing Fountain Idea! (Highly Suggested!)

So, Sometimes You get Blitz pulled from outside fountain and die, Basically you can be BM'ed from inside the safest place on the rift. or legit get killed by any champion from inside

I was suggesting that maybe you can make a small box inside the fountain that is immune to all damage or cc except karthus ult. because well... that is his ult. and i respect it regardless if i hate him or like him.

Its aggravating to keep dying over and over in fountain by people that just want to BM. and bring utter cancer to my body.