CLW' or 'WAT' limit is to do with engine performance, nothing else. It matters not which way you are pointing or what is 'in the way'..
For a Perf 'A' twin jet WAT limit will be the lowest to achieve:
For the 1st segment climb - a positive rate
" " 2nd segment - 2.4% one engine inop or 5.2% all engines
" " 3rd segment - 1.2% one engine inop
" " 4th segment - 1.2% one engine inop or 4.0% all engines
(I think! Perf A was a few decades ago
)
Looking at your posts, I ask what your interest is? Your profile is blank. Have you studied any performance stuff? It might help us to answer your questions..