If you want a controllable airplane, the most aft flying surface surface CANNOT stall at all. One of the production cessna had a problem of a stalling stab in certain loading conditions and was fixed by using a slot on the stab.

Usually while designing a aft tail airplane you want to make sure the Cl max of the airfoil is less than that of the main wing. and the incidence is used for trimming condition as Tall Paul said in his earlier post.

The rutan canards can't use more than 0.8 - 0.85 Cl max because of the main wing being the aft most surface.

Some people think the 3 surface airplane is the best. a canard, a wing and a stab.

my 2 cents

e=mc2