Hi guys for a 4000 sqft double storey house, a few questions to ask:

1. just use back original modem and router from TM and get a mesh either ASUS Zenwifi CT8/ TP-Link Deco P9 would solve the consistent connection around whole house?

2. The mesh is to be connected to the modem or the router?

3. any benefit or requirement to change the original modem and router from TM?