Miele KM 7999 FR Operating And Installation Instructions page 70

Installation
Safety distance when installing the appliance near a wall with additional
niche cladding
A minimum safety distance must be maintained between the worktop cut-out and
any niche cladding to protect it from heat damage.
If the niche cladding is made from a combustible material (e.g. wood) a minimum
safety distance  of 50 mm must be maintained between the cut-out and the
cladding.
If the niche cladding is made from a non-combustible material (e.g. metal, natural
stone, ceramic tiles) the minimum safety distance  between the cut-out and the
cladding will be 50 mm less the thickness of the cladding.
Example: 15 mm niche cladding
50 mm - 15 mm = minimum safety distance of 35 mm
Flush-fitted hobs
a Masonry
b Niche cladding dimension x = thickness of the niche cladding material
c Worktop
d Worktop cut-out
e Minimum distance to
combustible materials 50 mm
non-combustible materials 50 mm - dimension x
70
Hob with frame or bevelled edge