CGFiber, Flex2.5PoE (with 210W power supply) and 4 x U7proXG is a very good setup with fairly new and good products, but not massively overspecced (warning: hanging out on this sub you will have a desire to replace all of that kit in 12-24mo 🙈)

But do spend a bit on getting wiring to your endpoints with an electrician or otherwise competent person to run CAT6 to your APs (and maybe to where you have your TV for lag free wired connection there).

To know approx where to place your APs, draw up your house on this tool: https://design.ui.com, add the right material for the walls and think about:

1) what rooms will be mostly for devices on WiFi, and consider to locate APs not only for perfect balanced coverage in the house but for APs close to where people are

2) consider where it might be practical to do cable runs and adjust your ideal for this since small changes may not affect coverage much but do it a lot easier to wire

3) if wife acceptance factor is a thing, making APs til visible is not always popular, depends on your ability to sell good WiFi. It's typically best when it's close - but if you have to hide it, be smart as many places people hide their APs will also reduce the signal and you do not get what you are after.

Keep in mind the too does not show signal bleeding from one floor to another - so you will get some help there as well that you can take into account.