chasing shower waste ... or not

gday
She is wanting to instal a shower in 900 wide space on concrete slab adjacent to an external (but not in "public view") blockwall.

Is it better to:
A. track down a shower base with sides high enough for trap/pipe to run above slab and out via hole in blockwall, or;
B. chase trap/pipe into slab (including under blockwall...)?
and in either case,
does trap have to be directly under shower outlet or can it be further along pipe?

thanks for comments


Read the full thread at RenovateForum.com...