Both are separate mods that function without the other, but Defib Ragdolls has priority and will completely override this mod if both are enabled.
As for what you mean by 'mandatory to have a good gaming experience', well, they're simple mods, so they're not really mandatory.
Defib Ragdolls is the most gameplay significant as it makes the actual defib body flop around which can be good and/or bad in situations, Survivor Ragdolls is the safer cosmetic option as the actual defib body remains static and invisible.

I understand, it happened that the body fell a little forward and was in the shadow of the other behind, and when I resurrected it the other body remained on the ground, and with the Defib Survivor Ragdolls this did not happen.

does this mean we dont need this mod if we have the defib survivor ragdoll mod?