Proper use of placement prop

[vladguan]

First off, finally a vue 3 popper that can be placed over other elements. Anyhow, I am trying to use the placement prop and I get the following warnings:

StatusTemplate.vue:176 [Vue warn]: Invalid prop: type check failed for prop "placement". Expected Object, got String with value "right-start". 

I set it as:

<VDropdown :placement="getPlacement"
  ...
</VDropdown>

...

function getPlacement() {
  return showOnLeft ? 'left-start : 'right-start';
}

Is there a proper way of setting the placement prop?

Cheers
Vlad