Hey all, I am looking to get away from my old google wifi mesh system.  I am close to pulling the trigger on an omada set up.  I have a 1.5gb connection from my ISP.  I am aiming to get the ER707 router, a non-tp link 2.5gb POE+ switch, and a EAP670v2 to start. 

I have been researching for awhile before deciding on this setup.  I have a question though regarding AP coverage.  I have a 3 storey (basement, ground, upper) house, ~2200 sq ft,  open-ish layout, standard construction for NA, brick front, drywall/studs interior, 8' ceilings etc. 

Gateway needs to be in the basement, I do have cat5e wired to 5 drops around the house.  Multiple wifi devices, IoT devices.  Want to hardwire apple tv, PS5, and 3 computers.  I will deal with that later though.  Main concern is AP placement.

Is it feasible to mount the AP on the ceiling in the direct middle of the house on the topmost floor?  My concern is I will wire this up, and realise it doesn't cover the whole house, then I will have to move it, leaving some ceiling drywall repairs etc.

Or should I look at having 2 APs?

Any insight would be helpful!
Thanks!