Maintain body position during super O

Just wondering and curious
For those who are using aneros while lying on your back with knees in the air and feet laying flat

When you experienced super O
Are you able to maintain that position?

i could not
either my legs started to extend due to hard contraction of groups of leg muscles
or my back arched and pelvic lifted in the air
or i rolled to the side

it might not seem to be an issue but sometimes my orgasm is short lived as the aneros moved and hit another spot which is less pleasurable. Or, the aneros hit the right spot harder(when my back arched and pelvic in the air) but my muscles get tired fast as I need to work against the gravity.