While setting up my JRB BMB for the first time this weekend, I noticed that I could adjust the location of the tri-glides to be closer to the trees or closer to the suspension rings while still maintaining the 9.5' spacing between the rings. Not knowing if it mattered, I decided to split the distance between tree and the ring.

Is there a rule of thumb for the location of the tri-glide with respect to the trees and suspensions rings?

Also I tied a knot in the standing end of the webbing, at the triglide to protect against any slippage, but I wasn't happy with the resulting knot.

Is there a preferred or recommended knot for that application? Is the knot required [besides for my peace of mind]?