I think the recommendation for spring planting is for transplanting one already growing on-site.
`I have a number of sasanquas, and they are a lot hardier than what you are reading.
while planting in the shade garden is the usual... I have some growing in full sun... Down here!
dunno bout the wind issue... I'm very opposed to being in the wind, I've left plenty of forest at the edge(s) of the garden / living space...
Personally, I'd plant this camelia someplace where it can be seen when it is flowering... which some of mine are doing now...
Are you sure that you were warned against morning sun?
That doesn't sound right.
The evergreens sound like a good place to plant, but I would endeavor to protect against afternoon sun. Morning sun is the good stuff.
https://www.tynursery.com/plan...
I think you should pay more attention to the soil...
does your soil retain water?
what's the perc like?
maybe research "soil percolation test", if you don't know what I mean...
I can't remember seeing these growing in heavy clay... but sand? no prob.