Dometic microwave convedtion oven

Just installed the microwave convection oven we purchased on sale at camping world that another member pointed out. It fits perfectly-looks factory installed. Only problem is we didn't have the screws to screw the frame into the wood of the cabinet. Now, I'm just hoping I didn't use the longer screws to attach the baffle and go through the microwave. I sure hope not.  Haven't had a chance to try it out, but when we plugged it in the time started flashing.  This sure is a great forum to gather information for us that know nothing.  Our r-pod is a used 2012 177 and the previous owner did not want a microwave, so none was installed.  I will post a picture when my daughter comes over and shows me how.