Direct-radiators are a requirement for Atmos heights. The only use for bi-poles are as your surround speakers; and even then, they are discouraged.
When Emotiva did a (for them) no-holds-barred Atmos demo at one of the big shows, they had four arrays of four E1 speakers for Atmos heights. They had to wire them series-parallel in order to have a decent impedance, as well as making a bespoke bracket to mount them like flower petals, but it was apparently good sound...
Basement 5.1.4: Anthem MRX 720, Monoprice 2-channel amp, Paradigm Prestige 85F/55C/15B. PSB Alpha A1/P3 for Atmos HSU STF-2, ATV4K, XBox OneS, Harmony Ultimate, Samsung 65" Q7D.
Living room: Yamaha YSP-6000 with 10" Yamaha sub, ATV3, Harmony Ultimate, 55" Insignia 1080P.