What do those two tees serve? Are those drains to another fixture?
If they are vents, then that is a flat vent under 42"
If those two serve drains, that's two fixtures draining over a third with no vent for the shower.
Busting the floor will not harm the pipes unless you score very deep with the concrete saw or the jackhammer hits the pipe.
Nonetheless no matter what happens, you can fix it with new piping.
I would never use a vent for a drain in a home. I'd figure out a different way to do it.