You have a router that connects to your modem and then additional mesh points. Does each mesh point connect to the router or can two mesh points connect to each other? Does each mesh point need a direct connection to the router?
Can you set up like:
Router connects to point 1 (line of sight)
Point 1 connects to point 2 and router (line of sight).
Point 2 connects only to point 1 (line of sight, point 2 will have too many obstacles between it and the router to talk to it directly).
Yes, mesh / 802.11s can do multiple hops, but it prefers fewer hops for speed and failproofing.
Thus one should try to keep jumps at a minimum by placing the main/master/primary Nest Wifi unit centrally, so secondaries can connect with it directly.
More info from a previous thread: