Hi, my wifi configuration now is ISP router in bridge mode > tp-link archer c-2300 router mode with 2  tl-wa850RE on the main router guest network. I want to upgrade just guest part of my wifi with deco m5.

What I want to do is to continue using my c-2300 wifi in my apartment on the 3rd floor of my house, connect c-2300 with LAN cable with deco m5 on the 2nd floor and create separate wifi mesh network with 3 x deco m5 for 2nd and 1st floor.  My question is can I and how, configure isolated mesh network with deco m5 (use LAN connection just for internet access)?

I hope my explanation is clear enough, english is not my native language.

Thanks