I have two different internet service providers in my house.  I currently have a Deco M5 mesh working with the faster modem working perfectly, where only tvs and home office laptop are connected.  The second slower network, where all other devices such as printers, Dyson filters, speakers, etc are connected through an old AirPort Extreme an AirPort Express network, which is slow and would like to upgrade to a Deco mesh replacing the slow apple network.

Is it possible to have two different networks working properly, coexisting?

Can I create a new mesh network with Deco products, E4 or M4?  or should I install another brand?  Eero?  

Google Nest?

I would rather continue with TPLink products