If your concern is weakening the frame, why not just weld the anchor to some plate steel, and mount the plate to the bolt holes with longer bolts?
Patrick
I would weld it to a plate and make the plate big enough to use the bolts already in place. There are a few reasons. The first is it looks like it might be difficult getting to the top of the anchor, to get good weld penetration. Those anchors are thick. You’ll have a much stronger weld, if you can maneuver around. Look at @bdog ’s post. He mounted his vertically. I am guessing this is so he could get to both sides. Another reason I would plate mount it is that it can be removed, later. I like to have options. The other benefit to a plate is you don’t compromise the paint on the grill guard.
If you’re set on welding it to the grill guard, which is what is pictured (it looks like the grill guard is bolted to the frame), I don’t see how it could create much issue, I just don’t think it’s the best way.