So if you go back 3-5 years then I would say prob 50%! that is super high. They had  a compressor issue that has ben addressed so I can once again recommend them and although I don’t have a crystal ball I can say it has dropped to more like 5% on par with most brand.  Ice and water dispenser models will be higher more like 8-12%

Yes 99% of all brands require this or the heat will warp the racks there is an exception as many GE models offer porcelain coated racks that are self clean approved so those you can leave in.

As far as cleaning the chrome ones baking soda and vinegar in a bathtub works very well and a scrub brush. Some people try putting ammonia in a garbage back with the racks but I don’t like the fumes it causes.  I actually pressure washed my once I put a towel down on a piece of wood, soaked them in degreaser for a few hours and power washed them they came out looking like new!

The height is the issue so a 16 cubic foot from Frigidaire and GE are 64″ tall they would be 28 and 29 wide. Those are the best bets as 64″ is a tough height to start with.