Like Evenstar said, if you get a boa and give them space, they tend to be semi arboreal.
I have my adult female in a 6' long, 3' wide, 4' high cage with branches and she tends to stay perched up high unless she comes down to drink some water.
I wouldn't go for a cage under 16" tall. I had my girl temporarily in a 421 by boaphile and it was hard taking her out of a 12" high cage.
Her cage:
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