@El-Maaloum 

You can consider the Omada EAP series, where you can choose to use multiple EAPs to achieve network coverage on two floors, and the Omada controller enables centralised management of these EAPs, which also meets your requirements that all the wireless network must have the same name.

Check this:

https://www.tp-link.com/business-networking/solution-list/

By creating a wireless network, you should always have the necessary and high-quality content to stay connected and in touch.