-
I assume your oven is at low level and not at waist height/part of a tall unit? Regardless, you will definitely need an oven housing and can't get away with legs alone to the underside of the oven. It is unlikely that you will see the carcass once fully installed although product depending there can be a dummy panel/door underneath.
Ease of installation depends on your oven output and whether it needs to be hardwired. If not, I don't see why your electrician couldn't install to get everything working and then unplug until the carcass is delivered in place.
Nothing is needed for the dishwasher. Fits into an open space (45cm in your case) with worktop and kickplate running past. You may need to have a notch in the kickplate to allow the door to open but that's relatively straightforward.
Sneaking suspicion I've pulled a CYOA and not ordered an oven housing unit and may possibly require one:
This is the oven: https://www.neff-home.com/uk/productlist/ovens-compact-ovens/ovens/double-ovens/J1ACE4HN0B
Installation instructions from page 32:
https://media3.neff-international.com/Documents/9001580274_C.pdf
TBH it doesn't look like it needs legs or a unit but I may be being dim - certainly the electrician just told me it looks like it needs a housing unit.
What are my options if it does need one?
Do you see the colour of the housing unit when the door is closed (because I'll never get one in time for Weds).
I could measure and leave a correct amount of space so I could order the correct one and install when it arrives (hopefully before Feb 2nd). Other?
Would love if I just needed 4 legs and to have done with but suspect I won't be so lucky.
See also the dishwasher - there's no housing unit, though I do have an appliance door. Don't have any legs - what do I need? https://www.neff-home.com/uk/productlist/dishwashers/fully-integrated-dishwashers/dishwasher-45cm-width/S975HKX20G