I have had an over-range microwave for over 10 years and it works
beautifully. It's a GE. However, if and when it fails I will simply
have it replaced. One thing you might consider is having a "hole" for
a regular microwave oven in your cabinet area, with a hole at the back
of the bottom for the cord and the electrical outlet just under it on
the wall, or with the outlet in the wall in the back of the hole for
the oven. Of course, you will need to know how large that space needs
to be for adequate air flow around the oven . . .