Over-the-range models typically have an exhaust vent on top for cooling the microwave mechanism. It can't be blocked.

The built in microwave look is nice looking but expensive when the microwave gives up the ghost because invariably the replacement is not exactly the same size.

That doesnt have the required ventilation clearance that the trim kits provide. It will be a very short lived appliance.

you can't build in a micro that is meant for over the range or hanging freely from a cab. They require diff venting specifications.

For a Micro to be ok as a built in, it will specify, "built-in" or "In-Cabinet" . If yours doesn't, you cant do it.

A lot of countertop model microwaves can also double as a built-in. It will let you know. Most of the built-ins need a deeper clearance on the sides and back. You'll have to look at the rough-in diagram to find out what is required (most are 2" on the sides, 2-4 on the back)

I saw one here the other day where they’d installed a regular microwave just like your picture but they had put doors in the front to close it up when not in use.

https://www.houzz.com/discussions/6225943/budget-kitchen-remodel#n=11

this one!

Thats an electrical code violation.

If the doors are open when using it, it’s still a violation? Looks like plenty of space around it.

The upper cabinet area in the OP pic above surely isn't an open space to the top of the microwave oven so opening the doors does nothing to promote venting the unit.

Yeah, you can install the GE Profile PEM31SF with the JX827SFSS or JX830SFSS trim kit to get that look but the cabinet still has to be 16" deep. Are there ventilation requirements? Dunno; the trim kit design may provide the needed ventilation.

the Sharp "Over the counter" microwave vents underneath. it can be captured on Left and right side and top and sits flush in upper cabinetry.

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