The number of heads you look into in a scene is not necessarily the same thing as the number of POVs in the scene.
Omniscient means you have a single narrative perspective, which can look into any character's head. Head hopping is when you use multiple third person limited perspectives within the same scene, or paragraph, so you're looking out of different characters' heads.
Unfortunately, many people confuse omniscient perspective with multiple points of view, which leads to all sorts of problems. The key to omniscient is that you have a single point of view: your narrator. They can look into every head, but they aren't looking out from any of them. In third limited, you're looking out from various characters' heads.
Omniscient looks in, limited looks out.
While it isn't popular any more, largely because it reduces tension and increases the emotional separation between the reader and characters, omniscient is a valid technique. Switching between multiple third limited perspectives in the same scene can be done - some authors have been very successful with it - but it's very easy to do badly, and usually comes across as sloppy writing.
It's also often ineffective, especially in dramatic scenes. The key to tension is ignorance; it grows from not knowing what's going to happen next, or not knowing what the other person really thinks.
The way to build page-turning tension is to make sure neither the character nor reader knows what's going to happen next - or what the antagonist is planning to do.
Still, the most important rule of POV is that you, the writer, need to control it and not let it control you. One of the reasons certain best-selling authors can get away with "head-hopping" is because they do it deliberately to create a specific effect.
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