Goal: I want to have 2 full siphons, one of them will be plumbed into a rollermat (RS1200) the other will serve as a bypass. Both will have gate valves. I am going to have a shelf directly above the red pipe. I can tuck them neatly yet very accessible on the left had side about 6 inches in front of the 90’s on the far left. This would be the top 2 1.5” red drains. The red is only partially glued. I could mount them anywhere from the second from the right t-slot that is mounted to the wall. However, if I mount them directly to the right of the dropdown by the 2 45 degree fittings, I will lose a bunch of shelf space right them. Does it matter if I am 6 inches or so from those 2 90’s on the far left?