Where should the Crit'Air sticker be placed on the windscreen?

Should the Crit'Air disc be attached to the bottom front offside of the windscreen on UKregistered cars?

What do new emissions rules mean if I'm buying a car before September?

I see there are huge discounts this month as dealers desperately sell models before new emissions rules kick in. If they don't sell the vehicles are they disposed off? What happens if I buy one now before...