Usually every supermarket accepts the coupons, but it's advisable that you ask the information desk before the purchases.
No, each coupon is redeemable only for the product and the quantities indicated on the coupon .
The coupon is issued as a pdf file. You can save it on your computer or other device and print it later.
Yes, but you can use only one.
It's advisable that you print the coupon again. A not readable coupon can be refused by the cashier.
Please, ask the information desk.