perfecxionX 10+ year member
CarAudio.com Veteran
I don't think rear speakers are worth having at all, especially with a smaller cabin like yours. They create all sorts of imaging/phase issues and the cones are going to be treated like a small passive radiator for the sub in the trunk. It would be better to just have the open holes in the rear deck to allow more bass from the sub to enter the cabin. I'd sell them altogether to devote more money to better overall front stage.