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This follows the same principle. This is from the FAQ

Q: Does a unit with Stealth that is in the open have its cover save improved from none to 6+? (p76) A: No, there must be a cover save to start with for it to be improved.

In the going to ground section of the rulebook it says that you get +1 to your cover save if you elect to go to ground.

Why would dropping down to the ground give you cover?

Most soldiers are trained to shoot at center mass. Dropping down makes it harder to be targeted.

Going to ground in the games works very well if your troops are in cover and are actively being targeted. It works very well with my kroot in wooded areas when I have them ahead of my forces. They get 2 plus saves.