Maybe but that has problems too. Most importantly the ability of a pilot to bail out with the prop behinh him. (the usual fix was to make the prop jetisinable)
In WWI (a bit off topic) though this wouldn't have mettered as the pilot wasn't going to be bailing out (no parachute) and would have "engine armor" behind him, albeit none for head-on attacks. (which were less likely aniway) This was done to facilitae nose armaments without syncronisation or high wing mountings.