Toilet Move Drain and Vent

[smacman7]

Greetings,

I am planning a full DIY remodel of our main bathroom. As far as plumbing goes, the plan is to replace shower/tub combo, replace large double vanity with a smaller single, and move the toilet a few feet to be next to vanity. My main question is about the toilet move, as the whole design of the bathroom hinges on this.

• Tying into existing drain stack – (Attached Photo) Would the best location be on the horizontal section where one of the vanity sinks drain into and possibly using the abandoned old wet-bar drain for new single vanity. Or, cut out wet-bar fitting and run the new toilet to that location?
• I am guessing either location will not have much movement to be able to glue in a sanitary tee without an additional coupling. Is it ok to use 4” rubber FernCo fittings either vertically or horizontally? Or is there a better method?
• Will either location of the tie-in require venting, or is this close enough to main vent?

Any advice would be greatly appreciated. I did scour this thread to make I wasn’t asking too many repeat questions.

Thanks!