Integrated fridges – help please

I am refitting a kitchen and would like to put two fridges side-by-side, under a worktop. Would like to have cupboard doors on them.
Owing to a sloping floor I will have more space than usual below the worktop – about 920mm. I can buy fridges described as ‘built-under’ that appear to have their ventilation grille at plinth level – which reduces the amount of space available in the fridge. They are around 820mm high. I can also buy integrated fridges which are designed to be set in a tall cupboard. These come at 88cm and their larger capacity would suit me well.
Can anyone tell me what sort of arrangement I need to house these fridges without them overheating? They will be well set out from the wall and will be at the end of a run.
Please don’t suggest a single tall fridge. It’s a difficult space!

Thank you,
Vivien