LucasIRL

Hi All, Building my first proper home cinema and my set up is: RP-6000 Rp-504C Rp-502s I have got two Atmos speakers cdt-5800 II and bought also a pair of cdt-5650 (got them to Ireland from Amazon US deals so wont send them back - ordered by mistake) My questions are: 1. should i sell those 5650 and get 5800 II or keep them ? 2. if keep them how they should be set up ? 5800 front heights and 5650 rear heights or other way? Thank you for your help. regards, Lucas Adamus