Whichever end they're on it makes the car inherently unstable because one end or the other will have better adhesion than the other.
My issue wasn't so much with which end you fitted them to, but rather the mixture.
both ends need constant "adhesion" for best results
the rears have 7mm of tread ,fronts 6mm
the Omega performed well under the circumstances .
In an ideal world ,i'd have had S&I front and back for TODAY's conditions ,but that couldn't happen today .
It may have been "less slippy" with ALL snow and ice tyres, but i coped.
I've been driving mostly RWD all my driving history ,including tractors on a farm as a kid
many people drive with crap, nearly bald tyres ,wrongly inflated
My original comment pointed to the benefits of "winter" snow and ice tyres in snow and ice conditions .
my "summer" tyres have good wet grip (B rated) and now it's raining