Three of the little rubber feet on the bottom of the MacBook Pro gave up the ghost over the past 6 months, making the laptop uneven on a flat surface and potentially able to scratch the new wooden table we have. Replaced them with four 3M Self-Stick Rubber Pads and that seems to be working well. Not only do they provide additional elevation to the laptop allowing some air flow underneath it, but they’re ‘grippy’ enough that they stop the laptop sliding around when seated on a lectern (which used to be a problem when lecturing or preaching with the laptop). Only disadvantage is that if you need to turn the laptop sideways on the table (e.g. to show someone something on the screen) you need to lift and turn, rather than slide and turn.