I've moved your thread to our Help Section where you will receive a better response.
But I will suggest some type of cover which enfolds an iPad........there are many covers which have varying degrees of protection.
Having a look at an Apple store would be a good idea.
Apple's Smart Case (not Cover) is a good starting place. In my opinion it offers pretty good edge (and corner) protection. Some people think its fit a bit sloppy, not being snug all the way around. I think of it as extra cushioning.
Or if you want extreme corner specific protection, there is always iBallz. A crafty handy person could probably make one of these.