Fastback rear speaker boxes

Thanks MVH. When I install its getting 2 speakers in dash with bracket from Jerry I will put 2 in rear boxes. Not sure whether to face speakers vert or horizontal. But I want them portable so if anyone is in back seat they can be moved from sitting on rear seat to beside rear seat.
I will also run wires for 2 more as I may add 2 more (6 in total) with kick panels.
Stereo installer told me $200 to install everything and that includes materials and labor for boxes.