Apparently this seller doesn't understand the difference between a passive and active sub?
I think you should remove the 111 and 110 for sure

Corner placement won't hurt a sub if it is decent and you are sort of pre-worrying about boom before you have it. At $200, you are going to have a hard time finding a sub that isn't somewhat boomy, so either save more or expect a little of that. I think the F12 would do fine.