So in the seventh Harry Potter book the plan to get Harry from privet drive is by creating six more decoy Harry's as they can't apparate or use the flu network as its being monitered and also to stop the death eaters knowing which house they are going to, fine.

My issue is they then use port keys to get back to the burrow. Assuming that for some reason the ministry of magic can't track them for some reason ( or else the death eaters would just know they all then moved to the burrow) why don't they use port keys from privet drive as surely a much safer and faster way to get everyone around and just put the protection on lots of houses to keep that bit of the illusion up???

Any answers really appreciated Tia is really bothering me rn