Hi guys & gals, just joined your forum glad to be here. Have a ? toilet drain. I'm installing a half bath in my home, the toilet is going over studded out concrete existing floor. I have decided to go with a rear outlet floor mounted stool so I can come out of the back of the toilet just a foot or so and then into an opening that goes under the house to a crawl space. This way I do not have to bust up any concrete. ? is when you come out of the rear of the stool do you have to 90 down immediately to get the flow, or can you go a few inches with some slope before you drop down.