Still searching for running boards that will fit the CX5 but not foul the jacking points. Posted a request to the Mazda facebook page, and they say "We did develop a running board with an external partner, but due to low demand we did not keep the accessory live in our catalogue. However, there are some dealers that are still showing the running boards in stock. Therefore please contact your local dealer to find out whether they do, or can point you in the direction of a similar product. The running board does not obscure the jacking points, especially if the vehicle lift has adjustable feet."
My local dealer is the one who warned me off the ones I can find on the market, so have asked Mazda to help me track down a dealer who may have a set still in stock.
Fingers crossed - will let you know how I get on.