A:Answer The front two feet are adjustable. I'm not sure what the design requirements were supposed to be, but it's a bit frustrating. You can get it plumb side to side, but if you want it plumb front to back, you almost need a shim the back.
Regarding venting, I was worried my set up was going to be too tight with less than 1/2" on both sides. I do have almost 8" behind, but it keeps up so far.