Here are the wheels we went with for our 2021 Telluride S. They are made by Ultra Wheel Company, model 460 "Atonement". They are 20x8.5, +35 offset with a 72.62 center bore (so I had to get a set of concentric rings off of amazon). Model number is 460-2891BK+35, and they were just under $200/each through Summit Racing. The fit looks and feels as close to stock as you can get with a 1.5" wider wheel. No issues what so ever. We originally wanted to go with 22's, but with our plans of driving on the beach a bunch in the summer as well as towing a boat around a bunch as well, we thought it would be better to not limit ourselves on sidewall height too much. Our next set of tires will definitely be a little taller than stock to help fill out the wheelwells just a smidge more.
EDIT: The 3rd pic was taken before the suspension settled out (uploaded it by accident). It was freshly dropped from the jack in that picture, that's why the wheel well gaps were so big. The first and second pics are after the suspension was settled.
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