wye45

I am doing this plumbing for my second story, this is the master bathroom. the farthest is the toilet, the middle is free standing tub and the closest is a shower. so my question is am I able to lay by wye down like I am and go straight into it instead of adding a 45 to it? In my head it looks...

To get right to it (I'll answer questions to flesh this out as you need it)... In Maryland (my own house)... REPLACING... Fernco 2"x2" coupling between... (the next 2 black bullets) 2" PVC vert. pipe (going up into Char 2x2" long-turn elbow, eventually leading up to sinks) 2" PVC pipe into...