IKEA Pax: possible to raise so that a vacuum robot can pass underneath

You can stabilize the base-cut Pax cabinet on the Pax back panel with two Ivar stabilization cross braces. If the cabinet is a standalone piece: screwing it to the wall is a good idea.

That is not enough. The particle boards bend downwards, causing the connecting fittings to be slightly levered out every time the doors are opened and the vibrations caused by that. The lower crossbar is one of the most important elements in the Pax.