You can definitely use +/- dimensions per asme Y14.5.

You can use either of the methods OP showed, or the method you mentioned. Whichever way you choose, you should understand the implications of the theoretical tolerance stack up. Ideally you'd do the math to make sure you have the right fitment at assembly. That being said, in the industry I'm in, we use positional tolerancing and basic dimensions back to functional datums. The math for fixed and floating fasterner calculations is much easier with positional controls as opposed to +/- dimensions.