A:AnswerYes, I do all the time, however, it depends on what you are warming up. As with any item the paper plate may become flimsy if you are warming up something greasy. If you cook it too long with a food that is moist the paper may stick to the turntable, so place a paper towel beneath to keep it clean.
A:AnswerI recommend the Panasonic 2.2 cubic ft full microwave. We had the same issue. Needed it to go above oven. My husband installed without trim. Still need to finish. But, it works for us! It does the job.
A:AnswerYes, you can buy one. I don't know what it's called so I would take a picture of it with a cell phone and take it to Home Depot.
I have one that I bought in a repair kit from CompUSA years ago so I would say you should be able to find it either at a home repair center or, if not, at a computer center.