Not like that! when you pull on it, it will in effect tighten up and try to pull the mountings on the steering guard towards each other. borrow a bridle first.
the idea of the bridle is that you get an even pull in one diection spread across two points, ie halfing the strain of a single pull.That set up means the strain on the shackles and what ever theyre attached to is pulling towards each other.How confident are you on your steering guard?
You're better off just attaching it to one shackle than do that, as said it's pulling the towing eyes towards each other, they're not designed to be loaded in that direction.
Get a 2m strop to use as a bridle.