I wouldn't spend the money on the MP60's. I have one on one end of my 96" tank and a WP40 on the opposite end. I run the WP40 at full power on else mode and the MP60 at 70%max on reef crest. I also have 4 overhead returns. I think 2 MP60's would be overkill on your tank. Just my 2c.
I would take the time to try and get the MP40 on the back wall. It may take a couple of tries to get it to line up, but it shouldn't be too big of a pain. Don't waste the time with the Koralia. If your gonna go that route get a WP40 and go with that.