The best Camellias in town here are planted infront of houses that face east or north on either side of the front steps. There is a 2 story Camellia infront of the little house next door and it seems to be a fairly strong grower, except for snow-load damage from last winter. There is 2 fish-tail Camellias in my block and the one on the South-west corner can become yellowish due to summer sun/drought (July/Aug) but the one facing North-East is always dark green and blooms nicely. The only time I've seen them do well in a south exposure here is if they have sufficient summer irrigation, feeding and protection from winter winds below freezing.
I believe they are under-utilized and under-rated for both commercial and residential landscapes. The nursery I work at always sells out early in the season.