From personnel experience, since grinders and buffers are being discussed. A work bench on which you will be disassembling or assembling engines, carbs, electrics, etc, should be capable of staying relatively clean. Don't mount a grinder to this bench. Grind a few items and you have carborundum grit everywhere and it is the devil to clean up. Mount the grinder/buffer to a pedestal to get the mess away from the work bench. I actually move my pedestal grinder out of the shop and on the drive to keep the grit out of the shop.
I also have my upright compressor on the same wall as the work bench and just off to one end. Makes use of air tools real handy.