For me Atmos is another world over 5.1. I would staple wires up and down the walls and duct tape speakers if I had too for atmos. Grab some SVS elevation speakers and you can always take them with you. Although...... I have had 5.1 for decades so maybe that might be enough for the year to enjoy. If you have the funds atmos all the way.
Denon AVR-X6500h Klipsch RP-8000f RP-440C (4) RP-150MS sides in parallel RB-51 rears, 4 JBL C67P pendants for atmos, 2 monolith 12" subs
Epson 5040UB, Sony Ubp-X700, AC infintiy T9, Nvidia Shield, 142" 2.35 silver ticket screen