they will stick out WELL beyond the original arches, so will need arch extensions and either cut the original arches to clear the tyre during normal suspension travel (retaining long bump travel/comfy ride) or mod the suspension to reduce bump travel (very stiff and harsh ride) to prevent tyre damage.
check out MicroPRO's "PROject PROfect" when he recently fitted 15x8xET0 on his
https://www.micra.org.uk/threads/project-profect.51159/page-37#post-747229
from wheels being within the arch
[ATTACH=full]52688[/ATTACH]
to adding big extensions
[ATTACH=full]52689[/ATTACH]
to finally with pokey 15x8xET0 wheels
[ATTACH=full]52690[/ATTACH]
