RBK753 placement

Hello,

I just bought an RBK753 system from Costco. The house is single story but has an odd layout. Kinda shaped like a U but the base and left line of the U a lot longer than the right line.

My current plan is to put

- Orbi router in the center of the U (that is my cable modem point and I cannot change it).

- One satellite in the center of the left line of the U and the other directly across (the top of the right line of the U)

1) What is the direction of the antenna in the Orbi RBR/RBS 750? Are there considerations on how the router/satellite should be facing to get maximum possible horizontal coverage? I am mostly interested in optimizing backhaul performance as the devices will likely be spread out throughout the house and cameras outside the house as well. 

2) I am looking at wall mounting the Orbi. Are there considerations to be made to the height from the floor for a one story house given that I would not care about signal strength in the attic and crawlspace?

Thanks.