I’ve mainly seen them used outdoors as hanging plants. My Variegated Hoya grows in a tall, narrow pot & is trained to grow over bamboo hoops. You could also use them in a mixed planting, train to grow on a trellis or simply sit on a table.
They’re sold in 4, 6, 8, & 10″ grow pots; usually with a hanger. My Hoya carnosa variegata which grows outdoors has 4-5′ trails. I saw a Hoya growing in a decorative hanging pot in Carpenteria, CA and the trails must have been 6′ long. In their natural environment many grow as climbing vines.