[Fagottino89]

at receiptmansion there are some fields like adress lines, postcode, so what adress should i fill there? One of their warehouses? Or official office? Or it's should be mine adress?

Should be your. Obviously compare the receipt to an original one to make sure all the details are correctly written

I've checked from those free templates on receiptmansion and decided to choose  laptopsdirect.co.uk cuz they have same mouse in stock. But they can crosscheck validity of that PoP, what to do with that?

There is not much you can do about that, if they check and see that your is fake, they will deny your claim, but there is nothing to lose I suppose, and from what we are reading on the forum here someone else made it with fake pop too, so worth a try.
About the quality of the POP, receipt mansion have good ones, however if you want to check an original one for the store of your choice, buy something cheap from the store and see the receipt they will give you