https://en.wikipedia.org/wiki/HJ-12

I appears that it has "top-down attack" ability.

"When engaging enemy tanks and armored vehicles, the HJ-12 aims to destroy the top of its targets, the more vulnerable point.^[7]"

This is the Javelin, which cannot use the :"top-down" approach against helicopters due to interference by the rotating blades.

https://www.youtube.com/watch?v=VVRhbfi_65o

2.50 min.

Does it mean that tanks can be protected against top-down attacks by adding some rotating blades on their tops?