Help

!!!
A few years ago a bought 5 in celling speakers and only 10 years later I am finishing my HT.
To complet the setup, I bought an Onkyo TX NR838 that allows me to play Dolby Atmos. I like to know if I can leverage partially those old speakers to create a Dolby Atmos (5.1.2) setup.
Questions...:
1- Can I use the
Ci200.3QT front right and left motorized in celling speakers to act as the Atmos height Left and right front speakers? or the Atmos speaker technology require other type of speakers...?
2- I plan to cancel the center in celling speaker (Ci200.3QT) and buy a Center KEF Q200c, and a right and left front Speakers KEF Q300 for the lower layer. Does is make sense to build the Atmos system with this configuration? or the Q300 and Q200c not the best choice within the KEF brand?
I plan to keep the two back surrounding in celling speakers Ci200.QT and the Sub (velodyne SPL 1200 Ultra Digital.)
Many thanks in advance for your help and tips
Luis