Apollo Microwave convection oven issue

I have a 2007 holiday rambler augusta sport. My apollo microwave went last year as well. I replaced the microwave with one that fit the space but the feet weren't in the same spot so i moved the the plastic brackets.. then added L brackets at the cabinet edge.. the microwave still bounces around quite a bit . i haven't figured out a wave to keep it really secure.. glad to hear that others have had the same issue and solved the problem better than I