I have mesh of three xe75. One of the the satellites is located near the house intake for the fiber intake. From here a wire runs to the main who is situated at the second floor (middle of the house). 
My question is, can I wire the satellite to get better coverage? So: can two units be wired directly from the source? 
The connection from main to this satalite is so so, and the satellite is located where internet speed is most important, home office, children's gaming room. 
 

Would be like having two mains I guess. 
 

If.possible, how do I do it? Plug and play?
 

If it is possible