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While these shrubs can be container grown, during winter they should either be indoors, an unheated garage, or planted in the ground. Containers often do not provide adequate winter protection for the roots of plants unless the pot is thoroughly wrapped, and in as warm a place as possible. This also depends on your climate, as those with less harsh winters can remain outdoors in their pots over winter.

This article will help with any pruning: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/pruning-rhododendrons.htm

Sounds like a great place for some Ostrich fern and Variegated Solomon's Seal. These plants will give a little color and take up the slack for the PJM. An azalea or Camellia sassanqua might look good there too.

"It's not unusual for newly planted rhododendrons to spend their first few years in the garden becoming established in place of setting flower buds and blooming. It doesn't mean anything is wrong, they just need time.

"Shade is probably the most frequent cause of failure to bloom with established plants. Sunlight, or at least light, is required to set flower buds.

Over fertilization with high nitrotgen fertilizers will produce vegetative growth in place of flower buds. Rhododendrons have low nutritional requirements compared to most other shrubs. Overfertilized plants will also be more susceptible to winter kill of both foliage and flower buds."

Read more: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-not-blooming.htm

Hopefully these articles will help: http://www.floridata.com/ref/r/r_canesc.cfm

http://www.rhododendron.org/transplant.htm

First, it depends on how newly planted they are, but as long as the weather is not too harsh they should be fine. You can always cover them up when bad weather is imminent but don't forget to remove the cover during the day.

After determining the mature size of each variety, add the diameters of each plant, and divide by number of plants. Example: if all 3 plants you've chosen will have a mature diameter of 8', plant then 8' apart if you want a hedge look, or 10' apart if you want them to have a little room between them. If you have one plant that will be 6' and another at 12', they should be spaced on 9' canters or further.