The best advice I ever received is to walk around your neighborhood to see what is growing, blooming and thriving.
I see plenty of plants for sale at my local nursery that I know do not do well in the hot sun and winds we get here.
I do have another rhododendron that I can’t remember where I bought it but it is not doing nearly as well.
I fed it a couple times this year already. I should go check for flower buds.