If they're truly that horrible in the cold/snow, GET 4!

You wouldnt want to induce over steering tenancy because only a pair of them on the car. I have ran new all seasons and new snow tires (firestone winterforce, paid $35 each off tire rack), on a fwd car, and it over steered during cornering if not prepared for it.

It's a Camry, they should do decent in the snow (unless it's the new slightly overpowered one) If you incist on snow tires, because the hydroedge tires are rated for 90k ish miles?, even cheap ones would do great.

I think it's overkill, because with decent all seasons it should do well, but a dedicated set of winter tires/rims is cheap compared to an insurance deductible, or a hospital stay (or worse)

If you get the tires on other rims, consider taking it to the place who sold you the hydro-edge tires to have swapped. This "should" keep the miles on the hydro edge tires documented properly for warranty reasons.

~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)