The most bloom reliable hydrangeas in 6B are hydrangeas arborescens (Annabelle, Invincibelle, etc. which produce mophead or lacecap blooms) and paniculatas (Limelight, Little Lime, Bobo, Little Quick Fire, Vanilla Strawberry, etc. which produce panicle shaped blooms; choose compact ones if space is limited). All of those are winter hardy to z3 and develop blooms on new wood so winter is not usually a problem for the flower buds.
Twist and Shout is a reblooming hydrangea macrophylla but, be aware that some of those rebloomers may have blooming reliability problems in areas where old wood gets killed by winter and where new growth/stems cannot grow old and tall enough to develop flower buds in a few months. But, I did not say your location was a problem; just be aware of this. Feel free to try with one and see how it does. Provide several hours of morning sun, no later than 11am. Then add more plants if all goes well.
Another possibility would be to use reblooming hydrangea serratas like the ones from the Tuff Series (Tiny Tuff Stuff, Tuff Stuff, Tuff Stuff Red, Tuff Stuff Ah Ha), the Let's Dance Can Do, etc. Serratas are smaller looking hydrangea macrophyllas that bloom later than macrophyllas. Some produce mophead blooms and other produce lacecap blooms. I would pick rebloomer versions of serratas. Or try an oakleaf hydrangea, hardy to z5. Its flower buds can get zapped by winter as they bloom on old wood but there are fewer blooming problems reported. They also have very nice Fall foliage. They are more drought tolerant too. There are tall and compact versions.
All of them are deciduous.
Q