Hello,

I'm looking to buy a XE75 3-Pack to get decent internet at my attic.

I don't have the option to lay a cable to my attic but I do have the option to lay a cable to my middle floor.

Also I don't have space next to my stairs so all the wifi signals have to go through 1 layer of concrete floor. 

The goal here is to get the best possible signal in Room 4

This setup is possible by doing a daisy chain setup with a ethernet/wifi hybrid. This should be the standard option but I was worried that the speed in room 4 would suffer because this setup has 3 nodes from router to computer 

Maybe these setups are possible as well? Could only having 2 nodes between the router and the computer make the configuration better for room 4?

The extra unit in the living room would be a bonus but not mandatory.  

What is the best setup for room 4 here? 
I hope someone can help me thanks!