i looked into some references and it seems that the best way to position a stroke patient is in a position of adequate perfusion and minimal stress on muscles and nerves. The health practitioner assists the patient to lean on the left, to increase blood flow to the heart and to facilitate digestion, and minimize GERD or heartburn. Then, a pillow is laid in between the legs to prevent compression of muscles, vessels and nerves, thus providing relaxation amd perfusion to the stroke patient. This is generally true if the left side is the strong side. If it happens to be the weak side, the practitioner flezes the left shoulder to prevent compression of the weak arm, then a pillow is used to allow comfort. A physical therapist or rehab medicine specialist may know better.
Head always at midline and head of the bed 30-45degress to facilitate CSF drainage. Turn the patient to sides every two hours to prevent sacral decubitus ulcers. Put anti emvolic stockings.