The best option is either two stomachs (one in torso and one in tail), or one long stomach that starts in the torso and goes down throughout their tail in my opinion
I find it more amusing than anything. I tend to think of it as more of a "crop" or something, so not quite in a belly but only delaying the inevitable.
The snake part should always start at the stomach area and not at the legs area. Nagas shouldn’t have hips.
Completely fair, though~ <3