Several of my older machines run on 10Base2 networks,
here.
I have found that traditional BNC tee's make cable dressing
problematic. But, "goal post shaped" tee's seem to be kinder
to the cables. (I haven't yet tried "F"-shaped tee's but I
suspect they wouldn't be as good as the goal posts).
If memory serves me right, Ethernet isn't tolerant of the "leg" of the T
being anything more than incredibly short, and the standards mention
something about that.
I've had success using 90 degree elbows (2 per connection). Radio Shack
should still carry them. It would make your "goal post" configuration.