You dont need anything special fitted to the car at all.... Alfa's are just like every other FWD car in snow driving.... IT IS ALL DOWN TO DRIVER EDUCATION, NOT WHAT TYRES,BRAKES,SUSPENSION & TRACTION IS ON THE CAR.
Snow driving training with the British army in Norway taught me that many, many years ago.
You basically do exactly the opposite of normal driving:
Downhill, use your gears gently going down the box to slow down only using brakes below 10mph and giving yourself plenty room 16X the normal distance between the vehicle in front for reacting and thinking time.
On the flat, pull away gently with the clutch and NO accelerator pedal in second gear, let the engine take the strain and the gearbox soak the torque up so no loss of grip, no wheel spin. Once you are away, then change up as soon as possible and gently use the accelerator... maintain a safe gentle speed and change down for corners well in advance so the engine braking comes into effect.
Uphill, Use a high gear so less chance of slipping and let the engine labour a bit more than normal... If it is struggling and almost stalling, chnage down quickly and still let it labour... avoid using the accelerator as it will break traction easily.... Plan ahead and keep your momentum going.
Getting stuck? Reverse and second gear with no acclerator (or you will dig a hole) and "rock" the car back and forth using the gears with the rocking motion and eventually you will gain traction to pull yourself out... Use common sense when parking and avoid soft surfaces or sideways inclines where the car is naturally going to be pulled downwards as you pull away.
If a hill is too steep or too slippy to get up and you have no choice, hazzard lights on and make sure it is safe to do so first.... Use reverse and reverse up the bank..... The beauty of reverse gear is it is straight cut and not helical like the foward gears (thus the whining noise when you reverse... It basically means that a lot more torque is transmitted through the gear and using it with no acclerator will prevent wheel spin yet get you up the bank as most of the weight of the car (with the engine) and the gravity of the rest of the car pushing downwards will give your tyres maximum traction...
Hope this helps....
In other words.... Take all of the above posts with tyres, snow chains etc. etc. save the money you were going to waste and pay to get the correct driver training with the money instead
... Skills last a lifetime, snow tyres dont!