The message
from Adrian contains these words:

Thanks !
Can separate 'side-by-side' units be 'stacked' vertically in a
suitable housing ??

Don't see why not, but bear in mind that you'll need a lot of
ventilation because you've got two heat-pumps chucking heat into the
same space at the back.

Personally I'd chuck 'em and have a proper fridge-freezer simply to save
on the power consumption.

--
Skipweasel
Pay no attention to that man behind the curtain.