Blue ox tow bar for 2015 grand cherokee question

You're actually going to have two tabs, one attached on the DS of the frame, and one attached on the PS. They will be spaced 34-3/4" apart, which is pretty wide. You can get a better idea by looking at the Installation directions

Note 12 only applies if you're going to use a towed vehicle mounted tow bar. If you're going to use a coach mounted tow bar you can ignore this note.

Note 13 is somewhat confusing and I think worth a call to Blue Ox for clarification.