I'm pretty sure those aren't bolt holes; the countersink appears to be the wrong way, towards the inside of the rings, as opposed to the face.
Generally, "bash guards" mount to the chainring bolts, which are much larger than those little holes around the edge of the rings themselves. They either mount like a 4th chainring, or in place of the existing big ring.
The only guards I've come across that mount to the edge of the ring itself are the plastic "protectors" that you find on hybrids ad recreational bikes; which are really there to protect your pants leg from the chain, than protect the chain from obstacles.