Is there a way to know, in a group of colliders, all colliders being mouse entered without Phisics.raycast?

Collider.OnMouseEnter called just for first visible collider. How can i get all colliders without using Physics.Raycast in every frame?

I don't believe you can - Unity is basically just doing a single item raycast for you every frame to make OnMouseEnter work, so there's nothing to worry about with adding a second one