Range extension in house, unclear and unsure what steps to take.

Last week I popped by the local meatball conglomerate to pick up some tasty snacks and ended up, as usual, spending to much money. Anyway, I picked up 3 timmerflotte and 3 alpstuga. (due to limitation of Apple home to show temperature in air quality monitors).

Each bedroom now has both, but I notice that the sensors on first and second floor simply don't connect. These do connect on the ground floor where the Apple TV is located.

I'm struggling a bit to extend range. The attic has an old hue bridge, but I don't think that works to extend.

What is a way to extend the range of all products so each connects.

I am not a fan of adding Home Spypods to my setup. Would adding a dirigera bridge on the first floor (halfway up) help? I'm pretty new to treads and matter type applications, but in the end I just want these things to report what they can to my apple home setup so I can keep an eye on the kids bedrooms for air quality and temperature.