Dont know much about hotels, and my company isnt splurging on anything special, but if you want to be near the fairly limited kosher food selection, you want to be around the overland park area.
Hen house supermarket on Roe Avenue has an ok Deli selection (get their relatively early, deli closes i believe at 5, and the display cases afterward can be hit and miss)
Most of the bakery is kosher, and there Focaccia bread is great IMO (Feta+Spinach focaccia is my go to, but they are all good) Very large selection of cookies, cakes, pies, kosher doughnuts fresh every day.
Also have packaged cold cuts & Cheese