Apistos generally ignore tetras IME except perhaps during spawning. I have some Apistogramma macmasteri in the same tank with some rummynose tetras and the tetras are being left alone because they usually swim at a different water level. It does depend on the size of the tank and how heavily planted it is.
They'll be just fine together. I have an A. borelli and A. cacatuoides in the same tank as Rummynoses and Harlequin rasboras with no aggression at all. I also keep a German Blue Ram and an Aequidens curviceps with my glowlights in another tank and they're cool with each other.
My male A. elizabethae only gets aggressive towards the tankmates (Ember tetra and Corydoras panda) around feeding time and it is not full-on aggression but merely a quick charge that causes them to retreat or in the case of the Corydoras - nothing.