Gerry McCann searched under the beds;
He remembers that after it was known that Madeleine had disappeared he looked for her all over the apartment. He particularly remembers having looked under all the beds
https://www.mccannpjfiles.co.uk/PJ/GERRY-MCCANN-ARGUIDO.htm
I know she was small for her age, but would she have fitted under there?

Every normal and natural reaction of parents to the most stressful event of their lives is cynically questioned by you who cannot even know for certain
that is the bed Gerry actually looked under.
Didn't the Portuguese police also check under the beds for a missing, possibly hiding child? If they didn't - why didn't they!
Standard procedure I would have thought.
In which way does your post approximate information regarding any known facts about Brueckner.
In which way does it address speculation about Brueckner.
Is it your suggestion that Brueckner may have been hiding under the bed you think Gerry may have looked under when it was discovered Madeleine was missing?